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Old 10th Aug 2020, 4:30 pm   #1
eddie_ce's Avatar
Join Date: Aug 2010
Location: nr. Hannover, Germany
Posts: 273
Default Signal tracer

Inspired by Neil (newlite4's) recent post regarding his design for a signal tracer, I decided it was time to do a bit of home construction. I particularly liked Neil's design because it was without frills and more to the point I had all the parts needed.

I modified the circuit somewhat and have redrawn Neil's original circuit, hopefully not having made any errors in the values of the individual components as the original drawing was a bit fuzzy. The two resistors in the heater circuits are to bring the voltages down to 6.5V. The original transformer was meant for 220V, so the outputs are a tad on the high side.

I have enclosed a few pictures of my creation which works a treat. There is a very small amount of mains hum with no signal which may be due to sub-optimal wire routing, I will look at that although it isn't very noticeable. Also I'm not entirely happy with the front panel labelling, I might have to resort to Letraset.

All in all a very enjoyable project. Thank you Neil.
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Attached Files
File Type: pdf Tracer.pdf (52.9 KB, 60 views)
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Last edited by eddie_ce; 10th Aug 2020 at 4:36 pm. Reason: additional information
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Old 11th Aug 2020, 12:13 am   #2
joebog1's Avatar
Join Date: Jun 2015
Location: Mareeba, North Queensland, Australia
Posts: 1,216
Default Re: Signal tracer

Beautifully made !!! and its a REAL one. Not an LM380 with a diode glued to it.

superb work
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Old 11th Aug 2020, 3:51 pm   #3
newlite4's Avatar
Join Date: Nov 2003
Location: Bath, Somerset, UK.
Posts: 1,475
Default Re: Signal tracer

Nice one Eddie, really like the tag board wiring and especially like the use of a UY85 rectifier (I think I had just about run out of space on my chassis for a tube rectifier). We will have to start a tube signal tracer challenge contest .
preserving the recent past, for the distant future.
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Old 11th Aug 2020, 4:34 pm   #4
Bufo Bill
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Join Date: Jan 2016
Location: Wolverhampton, West Midlands, UK.
Posts: 425
Default Re: Signal tracer

That's a lovely looking build, great skill shown IMO.
Cheers from Bill.
My Hi Fi separates have a combined age of 297.
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