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Circuit Boards

All our boards feature:

  • Double sided design with 70um copper traces (twice the standard density)
  • Gold plated through holes and vias
  • Flame resistant FR-4 military grade glass passivated substrate
  • Silkscreened part placement guides
  • Sent the same day*

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  1. Top

    Aleph J (2 PCBs included, which makes 2 channels)

    $25.00

    This set of circuit boards will make the Aleph J amplifier of Nelson Pass. This amplifier is a direct descendant of the legendary Pass Labs Aleph 3, the amplifier that turned the audio press upon it's ear, brought single-ended amps to many people, and catapulted Pass Labs into the forefront of specialist audio engineering and construction, where it still resides today.

    Populate these boards with your components, then add your own power supply, chassis and heat sinks to complete the amplifier.

    Circuit description

    The Aleph J is a single-ended, Class-A, Mosfet power amplifier, with a Jfet driver stage. It utilizes the Nelson Pass 'Aleph Current Source' to greatly increase the overall efficiency of the output stage, with the benefits of more linearity, a higher damping factor, and greater stability into tough speaker loads, doing all this with less negative feedback than it's predecessors. The Aleph J is a regular kind of amp - a voltage source amplifier, requiring nothing out of the ordinary from the preamp or the speakers.

    Output power

    As with most of the Firstwatt amplifiers the power output is 25WPC into 8 ohm.

    PSU requirements

    A Bipolar power supply of (+/- 24V) is required. This will require an 18V+18V (or 36V Center Tapped) transformer from 300-500VA, and PSU capacitance of 30,000uF per rail or more. A PSU for the F4, F5, or similar will be appropriate. See the build guide (coming soon!) for details.

    Chassis (heatsink) requirements

    The 4U 'Jack of all Chassis' is ideal for this amplifier. If making your own chassis a good rule of thumb is at least 25sq inch (160sq cm) of finned heatsink per output transistor. (More is always better.) The DIYaudio "Universal Mounting Spec" (UMS) is a common mounting pattern between the amplifier PCB and the heatsinks. If you utilize the UMS on your heatsinks or use one of the pre-drilled chassis from DIY audio, you will be able to quickly and easily mount different amplifier boards in the same chassis. For example, a 4U 'Jack of all Chassis' with a 400VA, 18V+18V transformer and PSU board, will give you a power supply and chassis where you could try the F4, F5, F5C, Aleph J, and other Pass/Firstwatt amps in the future merely by swapping the amp PCB. The investment in Chassis and PSU needs only be made once.

    Links coming soon.

    http://www.diyaudio.com/forums/pass-labs/224881-aleph-j-universal-mounting-spec.html

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  2. F-5T (6 PCBs, Makes 2 channels; Rev3.0)

    F-5T (6 PCBs, Makes 2 channels; Rev3.0)

    $49.00

    Details

    This set of circuit boards is used to make the F-5 Turbo power amplifier from the mind of DIY hero and audio genius, Nelson Pass.

    One set of PCBs will make a stereo F-5T v2, or a single monoblock F-5T v3.  This is the third revision of the boards, which has nothing to do with using them to make a V2 or V3 F-5T!

    Please read the F-5 Turbo Article written by Mr. Pass to familiarize yourself with the different versions.

    Circuit Description

    The F-5 Turbo is a Push-Pull, Class-A power amplifier. Esentally a scaled-up F5, with more output devices and a higher voltage power supply. The F-5 Turbo is a voltage source amplifier, requiring nothing out of the ordinary from your preamp or speakers.

    The F-5 Turbo is the biggest offering in the Nelson Pass/Firstwatt DIY series of amplifiers. The v3 will handily drive 100Watts into 8ohm, and much more into 4ohm. This circuit also has the ability to scale up to truly amazing power levels.

    Populate these boards with your components, then add your own power supply, chassis and heat sinks to complete the amplifier. The mounting hole spacing is compatible with the diyAudio UMS mounting pattern found in the Deluxe Chassis.

     

    Output Power

    • F-5T v2 - 50 Watts per channel into 8ohm
    • F-5T v3 - 100 Watts into 8ohm. (The v3 should be built as monoblocks.)

     

    Power supply requirements

    A stereo F-5T v2 requires a bipolar power supply of (+/- 32V). This will require an 24V+24V (or 48V Center Tapped) transformer from 600-800VA, and PSU capacitance of 80,000uF per rail or more. The DIYaudio Universal PSU v3 was made with the requirments of this very amp when it was designed.

    The F-5T v3 will require two of the above PSU. (One for each monoblock)

    The amplifier has the ability to use a higher voltage PSU for more power, but you must 'cascode' the driver stage of the amp to protect the input Jfets. (And have even more heatsink.) See the article for more details.

     

    Chassis suggestions

    This is a high-wattage Class-A amplifier. It has lots of excess heat that needs to be dealt with. The 5U Chassis is of suitable size and disipation for a Stereo v2 or a mono v3.

    The 5U Deluxe amplifier chassis  makes a great home for this amplifier, and has pre-tapped holes that match the circuit board and transistor mounting positions.  The DIYaudio "Universal Mounting Spec" (UMS) is a common mounting pattern between the amplifier PCB and the heatsinks. The new revision driver board will fit on the heatsinks, between the output boards.

     

    Helpful Links

     

    Other Notes

    • The F-5 Turbo, an F-5 on steroids, with outputs up to 100w per channel
    • With these PCBs you can make a 2 channel amp, or a massive monoblock depending on the output desired, PSU voltage, and the heatsinking available! Either way it should be used with the 5U x 400 chassis. You could also make a smaller monoblock using the 4U x 300 chassis, and only 2 of the output boards.
    • For questions about the PCB itself and myriad links to the original article, discussion threads and build threads, please see the F-5T boards support thread
    • This is not a beginners project.
    • These boards are the newest revision, having a new layout of the Front-End board featuring many new solder pads, and rationalized labeling and numbering across all the PCBs. The layout has been only slightly modified, but it is different. Again we are only currently releasing a limited number to the community until we get more positive feedback.  Consider them beta boards (once again) and purchase and build at your own risk until further notice. For those of you with the older PCB, they are known to be fine.
    Learn More
  3. Soft Start Board itself

    New Soft Start & Speaker Turn-On Delay and DC Protector Boards (Set of 2 boards)

    $25.00

    Soft Start & Speaker Turn-On Delay boards (V3), compatible with 10mm x 10mm mounting specifications. Learn More
  4. F-5 clone boards (2 PCBs, makes 2 channels; Rev 3.0)

    F-5 clone boards (2 PCBs, makes 2 channels; Rev 3.0)

    $23.00

    This pair of F-5 Clone circuit boards use the same circuit as the Nelson Pass / Firstwatt F-5 model.

    Circuit Description

    The F5 is a Push-Pull, Class-A power amplifier. It is unique in that it has no capacitors in the amplifier circuit. The F5 is a voltage source amplifier, requiring nothing special from your preamp or speakers.

    The F5 is probably the most popular amplifier being built on DiyAudio these days. It is simple to make, sounds fantastic, and has similar gain to many commercial amps.

    Populate these boards with your components, then add your own power supply, chassis and heat sinks to complete the amplifier. The mounting hole spacing is the same as all other diyAudio Version 2 UMS boards.

    Power supply requirements

    A Bipolar power supply of (+/- 24V) is required. This will require an 18V+18V (or 36V Center Tapped) transformer from 300-500VA, and PSU capacitance of 30,000uF per rail or more. The PSU for the F4, F5, and Aleph J are all essentially identical. See the F5 build guide for details.

    Chassis suggestions

    The 4U Deluxe Amplifier Chassis makes a great home for this amplifier, and has pre-tapped holes that match the circuit board and transistor mounting positions.  The DIYaudio "Universal Mounting Spec" (UMS) is a common mounting pattern between the amplifier PCB and the heatsinks. If you utilize the UMS on your heatsinks or use one of the pre-drilled chassis from DIY audio, you will be able to quickly and easily mount different amplifier boards in the same chassis. For example, a 4U 'Jack of all Chassis' with a 400VA, 18V+18V transformer and PSU board, will give you a power supply and chassis where you could try the F4, F5, F5C, Aleph J, and other Pass/Firstwatt amps in the future merely by swapping the amp PCB. The investment in Chassis and PSU needs only be made once.

     

    Please see the F5 thread in the store support forum for any questions you might have and a definitive list of relevant links and resources.

    P-F5-1V20 Build Guide

    P-F5-1V20 Bill of Materials

    P-F5-1V20 Schematics

    P-F5-1V20 Dimensions

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  5. The diyAB "Honey Badger" Class AB Power Amp - 150W/Channel (2 Channels) Rev 2.4

    The diyAB "Honey Badger" Class AB Power Amp - 150W/Channel (2 Channels) Rev 2.4

    $39.00

    The first Class AB power amplifier to be featured at the diyAudio Store. It has been designed from the ground up with the sonic character, power output and most of all the DIYer in mind. With a basic power output of 150W at 8 ohms, this power amp is sure to have a place in every builder’s projects list. Not to mention its flexibility and adaptability to work with most output devices available locally in wherever country you may be.

    Please visit the Honey Badger Helpdesk Thread for any questions you might have and for a definitive list of links to all articles and discussions about the amp itself, the build guide, schematics, and Bill of Materials.



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  6. Layout

    Super Regulator V2.2

    $19.00

    Learn More
  7. Amp Camp PCBs (Pair) Ver 1B

    Amp Camp PCBs (Pair) Ver 1B

    $19.00

    Two Green ACA Printed Circuit Boards with gold plated traces for those who want to find all the parts themselves. Mounting holes fit the Universal Mounting Standard. You don't need these if you're buying the component and PCB kit - they are already included in it.

    This new version of the Amp Camp PCB comes with minor improvements over the original V1.0

    Learn More
  8. Universal PSU V3

    Universal PSU V3

    $29.00

    The all new Universal PSU. Bigger and badder. Details to come very soon though!

    Learn More
  9. F-4 clone boards (2 PCBs, makes 2 channels; Rev 2.0)

    F-4 clone boards (2 PCBs, makes 2 channels; Rev 2.0)

    $25.00

    Sold out!

    This pair of F-4 Clone Boards use the same circuit as the First Watt F-4 model.

    It sounds very good, and is extremely versatile, as each channel can be used separately, or a stereo amp can be run balanced for high power. The Amp has no voltage gain so works best when paired with an active preamp that has reasonable gain. Populate these boards with your own components, then add your own power supply, chassis and heat sinks to complete the amplifier. These generously sized, high quality boards spread the six output MOSFETS for efficient cooling. The mounting hole spacing is the same as all other diyAudio Version 2 boards.

    Please see the F4 thread in the store support forum for any questions you might have and a definitive list of relevant links and resources.

    The 4U Deluxe Amplifier Chassis makes a great home for this amplifier, and has pre-tapped holes that match the circuit board and transistor mounting positions. The DIYaudio "Universal Mounting Spec" (UMS) is a common mounting pattern between the amplifier PCB and the heatsinks. If you utilize the UMS on your heatsinks or use one of the pre-drilled chassis from DIY audio, you will be able to quickly and easily mount different amplifier boards in the same chassis. For example, a 4U 'Jack of all Chassis' with a 400VA, 18V+18V transformer and PSU board, will give you a power supply and chassis where you could try the F4, F5, F5C, Aleph J, and other Pass/Firstwatt amps in the future merely by swapping the amp PCB. The investment in Chassis and PSU needs only be made once.

    P-F4-1V20 Bill of Materials

    P-F4-1V20 Schematics

    P-F4-1V20 Dimensions

    Learn More
  10. Mezmerize B1 Buffer Preamp (Makes 2 channels; Rev 1.0)

    Mezmerize B1 Buffer Preamp (Makes 2 channels; Rev 1.0)

    $25.00

    The Mezmerize is a direct coupled preamp (no coupling caps) based on Nelson Pass's B1 Buffer. It boasts symmetrical Salas shunt voltage regulators that use LED strings for very accurate voltage reference. Included in the board are provisions for up to 6 relays for input signal switching and an output relay for delayed start-up muting. Being based on a B1 Buffer, Voltage Gain should be close to 1.

    Please visit the Mezmerize Helpdesk Thread to ask any questions and get a definitive list of related resources on diyAudio.

    P-MEZB1-1V10 Bill of Materials

    P-MEZB1-1V10 Schematics

    P-MEZB1-1V10 Dimensions

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  11. P-BAGSN-1V20 - Burning Amplifier Gain Stage for BA-3 (Requires bias boards and output stage; Makes 2 channels; Rev 2.0)

    P-BAGSN-1V20 - Burning Amplifier Gain Stage for BA-3 (Requires bias boards and output stage; Makes 2 channels; Rev 2.0)

    $14.00

    Sold out!

    Burning Amplifier Gain Stage Board. (One board works for 2 channels)

    The BA-3 front end is the latest feedback-less "front end" for the Burning Amp series of Class A Mosfet follower output stages.

    Check this link for an interesting build.


    Please visit the
    Burning Amplifier Helpdesk Thread for any questions you might have and for a definitive list of links to all articles and discussions about the Burning Amps.
     

    P-BAGSN-1V20 Bill of Materials

    P-BAGSN-1V20 Schematics

    P-BAGSN-1V20 Dimensions

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  12. P-BAGS-1V20 - Burning Amplifier Gain Stage for BA-1 & BA-2 (Requires bias boards and output stage; Makes 2 channels; Rev 2.0)

    P-BAGS-1V20 - Burning Amplifier Gain Stage for BA-1 & BA-2 (Requires bias boards and output stage; Makes 2 channels; Rev 2.0)

    $7.00

    Burning Amplifier Gain Stage Board which handles voltage gain for two channels when you populate it with your components. This board is required for both the single-ended BA-1 amp and the complementary BA-2 amp. 

    BAGS is the Burning Amplifier Gain Stage board. Being the Front-End, this is where all the signal voltage gain of a Burning Amp comes from. It's main purpose is to provide adequate gain to drive the suceeding output stage of a Burning Amp assembly.

    Please visit the Burning Amplifier Helpdesk Thread for any questions you might have and for a definitive list of links to all articles and discussions about the Burning Amps.

    P-BAGS-1V20 Bill of Materials

    P-BAGS-1V20 Schematics

    P-BAGS-1V20 Dimensions

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  13. P-BAS-S4V20 - Burning Amplifier Single-ended Bias and Output Set for the BA-1 & BA-3 (Requires a gain stage; Makes 2 channels; Rev 2.0)

    P-BAS-S4V20 - Burning Amplifier Single-ended Bias and Output Set for the BA-1 & BA-3 (Requires a gain stage; Makes 2 channels; Rev 2.0)

    $28.00

    Two P-BASO-2V20 output boards and two P-BASB-2V20 bias boards. The bias boards are only available in this set. Populate this set with your components and the P-BAGS-1V20 gain stage, then add your own power supply, chassis and heat sinks to complete the BA-2 amplifier in the 3 output pair per channel configuration recommended by Nelson Pass.  If you want more output devices order another pair of output boards here.

    Please visit the Burning Amplifier Helpdesk Thread for any questions you might have and for a definitive list of links to all articles and discussions about the Burning Amps.

    P-BAS-S4V20 Bill of Materials

    P-BAS-S4V20 Schematics

    P-BAS-S4V20 Dimensions

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  14. P-BAC-S4V20 - Burning Amplifier Complementary Bias and Output Set for the BA-2 & BA-3 (Requires a gain stage; Makes 2 channels; Rev 2.0)

    P-BAC-S4V20 - Burning Amplifier Complementary Bias and Output Set for the BA-2 & BA-3 (Requires a gain stage; Makes 2 channels; Rev 2.0)

    $25.00

    Two P-BACO-2V20 output boards and two P-BACB-2V20 bias boards. The bias boards are only available in this set. Populate this set with your components and the P-BAGS-1V20 gain stage, then add your own power supply, chassis and heat sinks to complete the BA-2 amplifier in the 3 output pair per channel configuration recommended by Nelson Pass.  If you want more output devices order another pair of output boards here.

    Please visit the Burning Amplifier Helpdesk Thread for any questions you might have and for a definitive list of links to all articles and discussions about the Burning Amps.

    P-BAC-S4V20 Bill of Materials

    P-BAC-S4V20 Schematics

    P-BAC-S4V20 Dimensions

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  15. P-BACO-2V20 - Extra pair of Complementary Output boards (Requires gain stage and bias boards; Makes 2 channels; Rev 2.0)

    P-BACO-2V20 - Extra pair of Complementary Output boards (Requires gain stage and bias boards; Makes 2 channels; Rev 2.0)

    $20.00

    Sold out!

    Burning Amplifier Complementary Output Board pair, one for each of 2 channels, with no components, These are designed for the Burning Amp BA-2 which is a complementary design. Usually people order these if they want the 6 output devices per channel with the Burning Amplifier Complementary PCB Set (P-BAC-S4V20). They are also useful to simplify building output stages of other complementary designs.

    Please visit the Burning Amplifier Helpdesk Thread for any questions you might have and for a definitive list of links to all articles and discussions about the Burning Amps.

    P-BACO-2V20 Bill of Materials

    P-BACO-2V20 Schematics

    P-BACO-2V20 Dimensions

     

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  16. P-BASO-2V20 - Extra pair of Single-Ended Output boards (Requires gain stage and bias boards; Makes 2 channels; Rev 2.0)

    P-BASO-2V20 - Extra pair of Single-Ended Output boards (Requires gain stage and bias boards; Makes 2 channels; Rev 2.0)

    $20.00

    Sold out!

    Burning Amplifier Single-Ended Output Board pair with no components, one for each of 2 channels.These are designed for the Burning Amp BA-1 which is a single ended design. Usually people order these if they want more than the 6 output devices per channel with the Burning Amplifier Single Ended PCB Set (P-BAS-S4V20). They are also useful to simplify building output stages of other single-ended designs.

    Please visit the Burning Amplifier Helpdesk Thread for any questions you might have and for a definitive list of links to all articles and discussions about the Burning Amps.

    P-BASO-2V20 Bill of Materials

    P-BASO-2V20 Schematics

    P-BASO-2V20 Dimensions

     

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