Belco Sig Gen. Age/Info etc - diyAudio
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Old 16th July 2008, 02:05 PM   #1
Mooly is offline Mooly  United Kingdom
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Default Belco Sig Gen. Age/Info etc

Hi,
Wondered if anyone could put an age to this. It's the first piece of test gear I bought ( 30 years ago ) and it was second hand then. It covers 20Hz to 200+ Khz sine and square. It is a classic Wein bridge osc tuned by a beautifully made variable cap. The PSU is (was ? ) unregulated, that little tranny gives 53 volts DC feeding a R-C filter network. I fitted a regulator years ago - a 7818 with diode "lift" in the center leg. Changed the caps as well.
I could never part with it -- just given it a good clean with foam cleaner (all the internals) and dried it out --- perfect.
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Old 16th July 2008, 02:06 PM   #2
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The PCB itself-- a lot of prescision resistors on there.
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Old 16th July 2008, 02:08 PM   #3
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The PSU. That would never be allowed today. Scary stuff, on an unearthed chassis. Even the paxolin switch has mains and LT on it
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Old 16th July 2008, 02:09 PM   #4
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Last one, that wonderful dual ganged variable cap. They don't make em like this anymore.
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Old 17th July 2008, 03:14 AM   #5
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Nice!
It looks like you might need to tighten the frequency adjustment shaft,it's a bit crooked!
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Old 17th July 2008, 06:22 AM   #6
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Hi,
Quote:
Originally posted by DigitalJunkie
Nice!
It looks like you might need to tighten the frequency adjustment shaft,it's a bit crooked!
Just a bit isn't it !! I will have to put a washer on the back to pad it out. The dial cord pulls so much on it perhaps I have worn the bearing away
It's a brilliant little piece of kit -- it's biggest failing is that the large metal dial picks up 50/60 Hz and modulates the waveform at low frequencies.
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