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Elektor AXL MOSFET PWR-amp + preamp

Here are some photo's of my recently finished DIY projects:
- AXL class-A power amp (Elektor design)
An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

- 6 channel relais switched preamp (own design)
It's actually more a buffered switchbox and volumecontrol, since there is no amplification at all. I wanted it to be simple and clean, no unnecessary buttons, only on/off switch, volume pot and input chooser.

Some specifications:
- 6 relay switched inputs
- 2 buffered outputs with OPA2134 buffer
- delayed output relay, to prevent noises when switching on
- volume control with blue ALPS
- volume controlled, mono subwoofer output with +12db amplification

Pictures of the preamp


An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.


and finally a photo of the preamp on top of the pwr amp
An externally hosted image should be here but it was not working when we last tested it.


For more info and 800x600px photo's check my website:
http://diyaudio.shorturl.com

Also Gainclone chipamp and fullrange speakers.