1DIFFQC Class AB 220Watt 4Ohm Amplifier Module

[pma]

No parameters, no measurements, strange pseudo-technical claims. 220W/4ohm from +/-42V unregulated power supply is close to impossible.

 

[modulardesign]

Heres an angle bracket for heatsink mounting

 

[modulardesign]

Heres a suitable heatsink

 

[modulardesign]

GROUND LOOPS and other noise part 2

Amplifier Board.

1. Ideally source devices and preamplifiers should behave like pickups, be it microphones, tape heads and cartridge's.
2. We expect that the output levels are safe.
3. As such their reference plane should not be connected to chassis. However it may offer a shield plane for the signal, however this should not be connected to chassis.
4. As per 1 any exposed chassis offers no danger and essentially behaves as a faraday cage. Devices having lethal voltages such as tube preamplifiers will have an earthed chassis. No connection exists between this chassis and signal ground. This chassis could essentially be an earthed faraday cage.
5. Thus even integrated preamplifiers should have a separate power supply not connected to the amplifier main power supply or they can have a shared power supply with only one earthing point with no connection to chassis. Ideally an integrated preamplifier has only one earthing point. The inputs and outputs. The upstream device if any should also have an isolated supply and should behave like a pickup.
6.Power amplifiers may have the amplifier power ground connected to chassis earth, however if such an amplifier will be used for other purposes a ground lift switch may exist to separate chassis ground from amplifiers power ground.
7. A partial chassis may act more like an antennae and so depending on dimensions, limiting the bandwidth of the amplifier should address this problem as audio wavelengths are much more longer and so the temptation to also use the chassis as a ground plane is always at hand. The journey of equipment matching continues.

 

[DonR]

A difficult business to succeed in but I wish you all the best of luck. As was said above, if you can provide a working unit to our host to test and it performs as you claim, it should sell well.

 

[modulardesign]

A difficult business to succeed in but I wish you all the best of luck. As was said above, if you can provide a working unit to our host to test and it performs as you claim, it should sell well.

Thanks for your kind words. There's something brewing to make that happen

 

[modulardesign]

The new batch will be available December. Thanks for your patience.

 

[modulardesign]

I am thinking of what product content to put on this new channel. If you have video submissions you'd like to share including system sound demos let me know https://www.youtube.com/@modulardesignsystems

 

[TonyJZX]

 

[modulardesign]

 

[antcollinet]

If you want people to watch your video, it would be polite to give a summary of what it is telling us - so we can avoid wasting time clicking and viewing if it is not of interest.

Ta!

 

[modulardesign]

If you want people to watch your video, it would be polite to give a summary of what it is telling us - so we can avoid wasting time clicking and viewing if it is not of interest.

Ta!

Happy new year 2023 Tony
Its a documentation of various early experiences of the pioneers but everything is still relevant today. I was hoping to make it much more entertaining than a sit com but hope ave done a decent job