Well, yes, but......conventionally we imagine it flows from positive to negative, it doesn't really matter though...
Not sure how you deduced a direction from my comment?
It could have read either way.
I thought you were referring to Andrew's post about it flowing from 0V to negative, so it flows from the centre of the smoothing caps not back to it
2nd Time Around
This article in glorious colour from Electronics magazine might be of interest to all you Maplin fans .... Look on page 48.
See: http://www.americanradiohistory.com/Archive-Maplin-Elrectronics/Maplin-Electronics-1990-12-01.pdf
This article in glorious colour from Electronics magazine might be of interest to all you Maplin fans .... Look on page 48.
See: http://www.americanradiohistory.com/Archive-Maplin-Elrectronics/Maplin-Electronics-1990-12-01.pdf
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Hello thanks for the info .. I have already purchased the original magazine from ebay, but nice to have a scanned copy as been out of print for many years
Hello ..
This is another version of the maplin mosfet amp I have been working on, basically the same circuit but with LED current source at the front end , and with BF470 / 469 driver transistors.
The power supply is mounted all on the same board with heavy duty spade connections and PCB tracks .. works well with no hum etc
This is another version of the maplin mosfet amp I have been working on, basically the same circuit but with LED current source at the front end , and with BF470 / 469 driver transistors.
The power supply is mounted all on the same board with heavy duty spade connections and PCB tracks .. works well with no hum etc
Attachments
Nice, I attached a phono socket directly to the original amp boards, I don't know why it isn't done more often. Have you tried using Belleville washers for transistor mounting? Belleville washer - Wikipedia
well done .. never knew there was such a thing as a Belleville washer ? thanks for the head up
I imagine from the layout and heatsink sizes, that there was no pretence that this version would still deliver 100W reliably .
This thread reminded me, I reworked the Maplin amp using a custom smaller PCB - I had a stock of a few pairs of 2SK135/2SJ50's and the small signal transistors from way back to find a use:
The output inductor is under the board as are the gate protection diodes & zeners.
Hello Mark ... that is indeed small, did your newly designed PCB work all OK? just out of interest did you make any changes to the design and component values? or transistor types? just curious to know
Best regards
100W continuous, no I suspect not, but its adequate for normal use I think, I tend not to listen to pure sine waves at 100% level (dub reggae perhaps being an exception!). The boards were tested to 100W briefly to check stability, and are awaiting a nice case plus preamp.