[JohnFerrier]

FWIW Steel is better at shielding low frequency tranformer noise than copper. Copper certainly will not hurt... See figure 16 here: http://www.analog.com/UploadedFiles/...6254AN-347.pdf


JF

 

[mtlin12]

why not use
sziklai-darlington diamond buffer (SDDB) for power output stages ?

from http://www.diyaudio.com/forums/showt...threadid=54247

I changed a little circuit of my own DB-01 headphone Amp recently,
to test the SDDB power output stages, and find it works very
good with my AKG-501.

I think it can be changed with only few components to
be a small Class-A power Amp.

here are the two circuits' pdf.files and pictures about the head
phone amp, please note the first output stage with only 4 bjts
, and the second with 6 transistors.

M.T.

ULTIMA-SDDB CLASS-A AMP CIRCUIT PDF FILE

DB-01 with normal 4-transistor DB

DB-01 with 6-transistor sziklai diamond output buffer

 

[individual6891]

Wow cool, the stacked PCBS remind me of my old GCSE project..

AM Transmitter for a remote control car. Acts like a transponder, sending a high logic output via AM encoder/decoder (HT12 series) to a seperate receiver linked to a PIC counter. Times lap times for RC cars, everytime they pass the white start/stop line

(yes that's a lot of dust)