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 ends up producing 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.
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 ends up producing 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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Hi,
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.
DigitalJunkie said: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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