Elliott Sound Products Purchase Information  

For added peace of mind, your package may be sent as registered mail (within Australia only), or insured (International only) The codes are shown below.

Order CodeDescription
REGRegistered Mail to AU$100 (Australia only)
INS1Insurance up to AU$100 (International only)
INS2Insurance up to AU$200 (International only)
INS1Insurance up to AU$300 (International only)
Price

To reiterate - Registered Mail is available only within Australia, and insurance is available only for overseas. The fee must be paid along with postage and handling charges - insurance or registered mail is in addition to the standard postal charges.

Please note that insurance on a standard package (as opposed to a 'large letter'') is not available to all countries. The only case I have come across so far is Germany, however there are bound to be others. If unsure, please contact ESP for confirmation. In other cases (the US and Canada being the most common) insurance is not available on a large letter, so anything that is insured must be sent as a package.

Note Carefully: If you choose not to take out insurance sufficient to cover the full cost of the order, my responsibility stops upon lodgement of the package at the Post Office. Should your package go missing (very rare, but it has happened), then the loss is yours. I will always endeavour to track what happened on your behalf and recover your goods if possible, but this is usually quite difficult.

Although most people do not have a high opinion of the postal services, it is my experience that international mail is treated by Australia Post and the postal services of all major countries with the highest integrity. Unless you have well-founded doubts about your postal service, I normally don't recommend insurance.


Purchase Details & Order Forms
 ModulesBP4078 Class-D Power Amplifier  

The module comprises a complete 400W (4 Ohms) amplifier, with balanced input capability. Please note that ESP no longer supplies these modules. Please contact ESP for purchase details.

Order CodeNA
Size (mm)96 (l) x 72 (w) x 39 (h)
Shipping Weight250g


M27A Guitar Power Amplifier  

This is fully built version of the P27A Power Amplifier Module. The power amplifier is not limited in any way to guitar use. In fact, its performance is as good or better than a great many hi-fi power amplifiers, including those at many times the price.

Order CodeM27A
Size (mm)115 x 65
Shipping Weight250g
Price


DF100 Digital Flash Trigger  

The DF100 is a slave flash synchronisation unit that triggers the external strobe on the second flash from a digital camera. It is designed to adapt older flash units (strobes) to new digital cameras that use a pre-flash to set the white balance.

Order CodeDF100
Size (mm)15 x 50 mm including sensor
Shipping Weight50g
Price


 Circuit BoardsProject 05 - Preamp Power Supply  

This supply is changed from the original project and Revision-A boards are now supplied. It includes better DC filtering to keep noise to the absolute minimum.  The supply can be operated from a single 15 or 16V AC plug-pack power unit, or a 15-0-15V transformer for maximum flexibility.12V (or other voltage) operation is possible, just by changing resistors.

Order CodeP05
Size (mm)89 x 46
Price


Project 06 - High Quality Phono Preamp  

The preamp is slightly changed from the project schematic. It is very easy to build, and gives performance that is second to none. Using 2 opamps, this preamp will outperform most of the circuits you find anywhere on the Internet or the high fidelity stores, with very low noise and accurate RIAA equalisation (but with an extended bottom end that sounds much better than the "true" RIAA equalisation curve).

The preamp requires a +/-15V supply. The board does not include an integral power supply to prevent the possibility of noise or hum. Use the P05 power supply board.

Order CodeP06
Size (mm)76 x 40
Price


Project 09 - Linkwitz-Riley Electronic Crossover  

The PCB version is slightly changed from the project article to be as flexible as possible, this is a complete stereo 2-way (or mono 3-way) crossover, with preset pots for level adjustment and output buffer amplifiers. To make a stereo 3-way unit, two boards are needed.  There are a number of options available during construction to make this crossover extremely versatile.

The board does not include an integral power supply.  Use P05 power supply board, or build your own.

Order CodeP09
Size (mm)101 x 71
Price


Project 19 - Single Chip 50W Amplifier  

Note that the Rev-B board has replaced the previous version. The order code and price remain unchanged.

The layout for this amp is unchanged from the latest version of the published project, Note that the SIM connections have been deleted for the Rev-B board now selling.

The layout comprises two amplifiers, individually fused on board. The board is designed to be able to be cut down the middle for separate amplifiers. The new layout accommodates PCB headers for DC and inputs, and PCB mounted quick-connect lug for the speaker output. Standard 1mm PCB pins can still be used if preferred.

Order CodeP19
Size (mm)115 x 40
Price


Project 26A - PT2399 Digital Delay  

The layout for the digital delay is unchanged from the published project. The PCB is supplied with the PT2399 delay IC, as many people will find these irksome to obtain in one-off quantities. The delay is inexpensive and easy to build. Like all ESP projects, it does require good soldering skills though.

The layout includes provision for delay time and repeat controls (8mm pots can me mounted on-board). The constructor can choose whether to use the full filters shown in the data sheet, or a minimalist arrangement that works well with short delays.

Note that there is a very small error on the board, which requires no track cuts or links. The fix is explained in the construction article.

Order CodeP26A
Size (mm)64 x 38
Price


Project 27A - 100W Guitar Power Amplifier  

The layout for this amplifier is the same as the new version of the published project. Features short circuit protection, and the ability to make the amplifier with a high impedance output, so it more closely matches the behaviour of a valve output stage.

Order CodeP27A
Size (mm)114 x 65
Price


Project 27B - Guitar Preamplifier  

The layout for this amp is as shown in the latest version of the project. The board is designed for maximum flexibility, and will accommodate various mounting methods. The pots and sockets do not mount on the board, so you have complete flexibility for your front panel layout.

Order CodeP27B
Size (mm)114 x 35
Price


Project 33 - Loudspeaker Protection and Muting  

The circuit for this project is changed considerably from the original published project.  The circuit is dramatically simplified so that the board could be made as small as possible, yet all functional parameters are essentially unchanged.

Order CodeP33
Size (mm)58 x 28
Price


Project 36 - Death of Zen Class-A Amplifier  
Project 70 - DoZ Headphone Amplifier  

The circuit for this amp is changed slightly from the original published project. The board is designed to allow a wide range of transistor and mounting options, and all components other than the output capacitor mount on the board (if flat-pack transistors are used).

The same board is used to build the DoZ headphone amplifier (Project 70), and the order code is unchanged. The construction details include the standard DoZ and the headphone amplifier variation.

The layout comprises one amplifier, and these boards are sold only in pairs.

Order CodeP36 (2 boards)
Size (mm)76 x 51 (each PCB)
Price


Project 37A - Minimalist Hi-Fi Preamp (DoZ)

The circuit for this amp is changed very slightly from the published project. The performance is really quite exceptional for such a simple circuit, and I have had many e-mails praising the sound of this preamp.

The layout comprises two channels. Multiple units can be powered from the one supply unit (details are included). The P37 board requires a power supply, such as P05 (available separately).

Order CodeP37
Size (mm)76 x 50
Price


Project 39 - Power Transformer Soft-Start Circuit  

The circuit for the soft start switch is as shown in Figure 6 of the project page - it is quite different from the previous versions. It is simple and reliable, and has relays and power resistors mounted on the board. All components except the transformer and mains switch are on the PCB.

Order CodeP39
Size (mm)28 x 32  70 x 32
Price


Project 3A - 60W / 8 Ohm Power Amplifier  

The boards and circuit for this project are slightly different from the published design, and the supplied circuit and BOM reflect the new schematic. There are some useful enhancements to the amp, which improve performance and make this a very easy amplifier to build.

The layout comprises two amplifiers, individually fused on board. The board is designed to be able to be cut down the middle for separate amplifiers.

Order Code P3A
Size (mm)162 x 74
Price


Project 60 - LED VU Meter  

A simple LED metering circuit, suitable for mic preamps, mixers, preamps and power amps. The PCB has a single meter on a small PCB that can fit almost anywhere on the front panel of an equipment case or small mixer.

Uses a single 15V supply, or for portable use, can be battery operated (using a 9V battery).

Order CodeP60
Size (mm)31 x 55
Price


Project 66 - Dual Low Noise Microphone Preamplifier  

A simple and high performance mic preamplifier. The PCB features two completely independent preamplifiers on a small PCB that can fit almost anywhere inside an equipment case or small mixer. Far better performance is available than with the majority of opamp based preamps, thanks to the use of a discrete front end.

Uses a +/-15V supply, or for portable use, can be battery operated (using 2 x 9V batteries). Low noise and current drain make this an excellent preamp for studio or field recording. The PCB is laid out so that the inputs and gain control connection points are widely separated to ensure low crosstalk.

Order CodeP66
Size (mm)65 x 65
Price


Project 68 - 300W Subwoofer Amplifier 

A high powered amplifier, designed especially for subwoofers. The board contains one amplifier, and uses six flat-pack power transistors (such as MJL21193/4 or 2SC3856/ 2SA1492), all mounted underneath the board. The entire amplifier assembly is then mounted to a suitable heatsink using the six transistor mounting screws.

Using a +/-56V supply, the amplifier will easily provide over 300W into 4 ohms. This amp is designed for intermittent (i.e. subwoofer) duty only into 4 ohms - do not use it in single board form for continuous heavy duty (for example PA or disco). As a 150W amp into 8 ohms it may be used safely for continuous operation.

Printed Circuit Board (Single Board)Discount - Buy Dual Board, Pre Cut
Order CodeP68Order CodeP68-2C
Size (mm)167 x 64 Size (mm)167 x 64 / 93 x 64
Price
Price


Project 71 - Linkwitz Transform Circuit  

The layout for this circuit is unchanged from the published project design. The layout comprises one transform circuit. Requires a power supply (e.g. P05) giving +/-12V to +/-15V at less than 10mA. Documentation includes the Linkwitz Transform Spreadsheet (Microsoft Excel format), which is needed to calculate the values for your loudspeaker and enclosure.

The board is designed to allow series resistors for all filter resistances, providing an easy means of getting an exact value. Capacitors are paralleled (up to 3) for each of the calculated values, so getting the odd values needed will be easy.

Order CodeP71
Size (mm)75 x 38
Price


Project 72 - Stereo 20W/ Channel IC Amplifier  

The layout for this amplifier project is unchanged from the published project. This is ideal as a first project, as it is inexpensive, but still has sufficient power to be useful for PC speakers, rear speakers for surround sound, or a small hi-fi.

The layout comprises two amplifiers, individually fused on board. The board is designed to be able to be cut down the middle for separate amplifiers.  The board looks very similar to the P19 board, and is the same size, so also makes an ideal companion board to Project 19 for tweeter amps in a 3-way system.

Order CodeP72
Size (mm)115 x 40
Price


Project 84 - 8 Band Constant Q Graphic EQ for Subwoofers  

The layout for this circuit is unchanged from the published project design.

The PCB comprises a complete 8 band constant Q equaliser, with provision for rotary pots to mount on the PCB. It uses 9mm square pots (also available from ESP).  Requires a power supply (e.g. P05) giving +/-12V to +/-15V at about 40mA.

Order CodeP84
Size (mm)114 x 75
Price


Project 87A - Dual Balanced Receiver  

The layout for this circuit is virtually identical to the published project design. The PCB comprises a complete stereo balanced receiver, with presettable gain and high Common Mode Rejection. Requires a power supply (e.g. P05) giving +/-12V to +/-15V at about 15mA.

Order CodeP87A
Size (mm)64 x 37
Price


Project 87B - Dual Balanced Transmitter  

The layout for this circuit is different from the published project design. This circuit has been simplified, but without loss of performance (the ability of the output to appear "floating" has not been incorporated, since that would increase the PCB size and cost, as well as the component cost).

The PCB comprises a complete stereo balanced transmitter. Requires a power supply (e.g. P05) giving +/-12V to +/-15V at about 15mA.

Order CodeP87B
Size (mm)64 x 37
Price


Project 88 - High Quality Audio Preamplifier  

The layout for this circuit incorporates some useful additions over the published project design.

The PCB comprises a complete stereo hi-fi preamplifier, with provision for DIP switches or jumpers to preset the gain over a wide range. Requires a power supply (e.g. P05) giving +/-12V to +/-15V at about 30mA.

Order CodeP88
Size (mm)75 x 40
Price


Project 93 - Microphone Amplifier  

This tiny board (13 x 50mm) is a complete balanced microphone amplifier, with phantom feed powering. It is suitable for use with measurement or recording microphones, and has high output and excellent linearity. It is intended for use with electret microphone capsules.

Order CodeP93
Size (mm)13 x 50
Price


Project 94 - Universal Preamp & Mixer  

This project is ideal for anyone needing a preamp with tone controls or a small mixer, or who needs the flexibility that the PCB allows. There are so many ways that it can be used, even as a building block for use in other projects. The layout comprises one stereo amplifier/ mixer.

Order CodeP94
Size (mm)75 x 52
Price


Project 96A - 48V Phantom Feed Supply  

The PCB for the 48V phantom feed power supply is the easiest way to ensure good results first time. The board has all components except the transformer, and there are no adjustments. Since the PCB is so small, it will be easy to locate in all but the most compact mixers, and provides a true 48V for up to 20 powered microphones at once. The layout comprises one power supply.

Order CodeP96A
Size (mm)64 x 38
Price


Project 96B - Phantom Feed Microphone Interface  

Applying phantom power to microphone lines has never been easier. This PCB provides "silent" P48V switching, full mic preamp protection and maintains the microphone balance to prevent hum and noise. The PCB has two phantom interfaces. Up to 10 of these PCBs can be attached to one P96A power supply.

Order CodeP96B
Size (mm)64 x 38
Price


Project 97 - Complete Hi-Fi Preamplifier  

This preamp uses PCB mount pots, and provides a complete stereo preamp with Bass, Treble, Balance and Volume controls. It is very simple to make, and requires 16mm PCB mounted pots.

The layout contains one stereo preamplifier, with all controls except source switching - this is left to you, since different people have different needs. Use P05 power supply and P06 phono preamp for a full featured hi-fi preamplifier.

Order CodeP97
Size (mm)165 x 38
Price


Project 99 - Stereo Subsonic Filter  

This circuit features a 36dB/Octave rolloff, ensuring that the output from phono playback or any other source has no frequencies below the audible range. Protect your speakers from excessive excursion and distortion. May also be re-configured to 18dB/Octave if desired. Use P05 power supply or similar.

Order CodeP99
Size (mm)64 x 37
Price


Project 101 - High Power MOSFET Amplifier  

The boards and circuit for this project are as published, and the supplied circuit and BOM provide all component values. This is an exemplary amplifier in all respects, with performance that is second to none. It is also a very easy amplifier to build. Only the power transistors require a heatsink - all drivers run very cool, even at the highest power levels.

Order CodeP101
Size (mm)130 x 63
Price


Project 110 - Infrared Remote Control  

There are two parts to the remote, and each is available separately for maximum flexibility. Since many people use learning remotes, it may be found that the transmitter is not needed in many cases.

The transmitter is available in two versions - P110AS (Small switches) and P110AL (Large switches). This is a short-form kit

Order CodeP110AS / P110AL
Size (mm)77 x 38
Price


The receiver board (P110B) is also a short form kit. The contents are listed below. All other parts are easy to obtain, and are fully described in the construction article.

Order CodeP110B
Size (mm)63 x 31
Price


Project 113 - Hi-Fi Stereo Headphone Amplifier  

This headphone amp is a flexible and easy to build project. It may be used as a headphone amp (somewhat predictably :-)), as a line driver, or even a spring reverb tank driver and recovery amp. It is very easy to build, and gives performance that is second to none. Using 1 opamp, this amp will outperform most of the circuits you find anywhere on the Internet or the high fidelity stores, with very low noise and the ability to drive multiple pairs of headphones.

The amp requires a +/-15V supply. The board does not include an integral power supply to prevent the possibility of noise or hum. Use the P05 power supply board.

Order Code [More]P113
Size (mm)76 x 40
Price


Project 122 - Mono Microphone Preamplifier  

This board is for a single channel microphone preamplifier. Unlike most ESP boards, this one is double-sided with plated-through holes.

The layout (marked as MIC001) contains one mono preamplifier, and is identical to the description in the project article. Use a P05 power supply or similar - a single supply will power several preamps, or a preamp and various other boards.

Order CodeP122
Size (mm)77 x 24
Price


Project 125 - 4-W L-R Crossover  

This 4-Way 24dB/Octave crossover board is the latest revision (Rev-C) of the board. Unlike most ESP boards, this one is double-sided with plated-through holes. Be careful during assembly, because rework will almost certainly damage the PCB unless you have experience with double-sided boards.

The layout (marked as LRX424) contains one mono 4-way crossover, and is slightly different from the description in the project article. Regulators are on board, but it's also easy to use an external power supply if preferred. (the P05 power supply for example).

Order CodeP125
Size (mm)144 x 70
Price


Project 126 - PWM Dimmer  

This board is for a single PWM (Pulse Width Modulation) LED light dimmer, motor speed controller, etc. Unlike most ESP boards, this one is double-sided with plated-through holes. Be careful during assembly, because rework will almost certainly damage the PCB unless you have experience with double-sided boards.

The layout (marked as LD10/20) contains one dimmer, and is identical to the description in the project article. It is designed to operate from 12V (nominal) DC power.

Order CodeP126
Size (mm)53 x 37
Price


Project 127 - Dual TDA7293 Amplifier  

This board is for a two channel TDA7293 IC power amplifier. All components and optional connectors mount on the PCB, which is powered from +/-35V to deliver 70W nominal into 8 ohm speaker loads. Unlike most ESP boards, this one is double-sided with plated-through holes. Be careful during assembly, because rework will almost certainly damage the PCB unless you have experience with double-sided boards.

The layout (marked as P127 Rev-) contains two amplifiers, and is identical to the description in the project article.

Order CodeP127
Size (mm)77 x 31
Price


Project 137 - Powered PA System Amplifier  

This board set is for a complete powered PA speaker system, including preamp, a 200W mid-bass amp and a 50W compression horn driver amp. Unlike other ESP projects, this includes a power supply. These boards are not available individually - they can only be purchased as a complete set of 3 PCBs.

Please note that these PCBs are all double-sided with plated-through holes. Be careful during assembly, because rework will almost certainly damage the PCB unless you have experience with double-sided boards. The layout is identical to the description in the project article.  

Preamp, 140 x 50 mm
Power Supply, 110 x 42 mm
Power Amp, 156 x 50 mm
Order CodeP137
Size (mm)See Text
Price


 Miscellaneous
Rotary Switch Extension Shaft  

When you build a preamp (either active or passive), it is always best if the selector switch (and often the volume pot as well) is at the back of the case next to the input sockets.  This keeps internal wiring to a minimum, and reduces capacitance and loss of high frequencies.

The extension shaft will allow you to have the selector knob at the front, and the switch at the back where it belongs. The shaft is very rigid, so will not cause the switch to have a "spongy" feel.

Comes with a panel mounting bush, and suits standard 6.35mm (1/4") shafts as found on nearly all switches and pots.  The standard length is 250mm. If you need a longer extension shaft, please e-mail me to discuss.

Order CodeES250
Size (mm)6.25 (dia) x 250
Price


PCB Pins 

It seems that these are not readily available, so now they are. They come in a pack of 50, and are suitable for the 1mm holes used in all ESP boards for just this purpose. Note: The pins are only available with another purchase (excluding P93) - they are not sold separately

Order Code [More]PINS
Size (mm)1(dia) x 12 (long)
Price


Measurement Microphone Hardware Kit  

Note: This is a short-form kit - you need to supply some parts, but all the hard-to-get components are included.

This microphone housing is basically as shown in the P93 article. The case is turned from a solid aluminium bar, and has an extension tube for the electret microphone. The case is 25mm (1") diameter and is 100mm long - the completed unit is 150mm in length overall - including the microphone (not supplied) and the XLR connector (supplied). Finish is polished aluminium.

Order CodeM01
Size (mm)See above
Price


Kapton Tape  

Kapton tape is sold by the metre, is 25um (0.001") thick and 25mm (1") wide. Used with heatsink compound, it will provide a low thermal resistance because it is so thin.

Order CodeKAP1
Size (mm)25 x 1000 x 25u
Price


Documentation CD-ROM 

Note: CDs are available only with a PCB purchase - they may not be ordered separately.

As noted in the purchase information page, documentation is not supplied with the boards. For those who (for one reason or another) don't want to log into the secure site, the complete contents are available on CD. This CD-ROM is provided free with any order over AU$100.00 (excluding GST and/or postage).

Order CodePCD
Size (mm)n/a
Price



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Copyright Notice. The information in this article, including but not limited to all text and diagrams, is the intellectual property of Rod Elliott, and is Copyright © 2002-2012. Reproduction or re-publication by any means whatsoever, whether electronic, mechanical or electro-mechanical, is strictly prohibited under International Copyright laws. The author (Rod Elliott) grants the reader the right to use this information for personal use only. Commercial use is prohibited without express written authorisation from Rod Elliott.