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Old 17th July 2013, 06:01 PM   #1
diyAudio Member
Join Date: Apr 2013
Location: Port Elizabeth
Cool Signal Injector

Hi there, I used to have a very simple signal injector which I bought from my local electronics store. Sadly the signal injector, and the electronics store, no longer exists.

Hence my query: -
This item was a one or two transistor unit which was mounted into a probe with a 1.5v battery. It functioned on about 1KHz with harmonics up to about 30Mhz(sounded terrible) but very useful for tracing signal paths in tuners, amps and testing random things!

It was partnered by a signal tracer(of similar description above) which featured a fet (high-impedance) front-end with a small audio amp and speaker. Does anyone know of a circuit diagram for the above species, which methinks, can easily be built onto Vero-board.
I know this is real low-tech , but should be fun to build!
Any-one help?
The Soundman
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Old 17th July 2013, 09:22 PM   #2
diyAudio Member
Join Date: Nov 2008
The Workman "Buzit". Sorry, I don't have more. E
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Old 22nd July 2013, 04:31 PM   #3
DF96 is offline DF96  England
diyAudio Member
Join Date: May 2007
The injector would probably have been a simple astable multivibrator.
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Old 22nd July 2013, 06:42 PM   #4
diyAudio Member
Join Date: Apr 2013
Location: Port Elizabeth
Any-one got a circuit diagram?
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Old 24th July 2013, 03:05 AM   #5
Enzo is offline Enzo  United States
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Join Date: Sep 2004
Location: Lansing, Michigan
Google "signal injector" and a number of opportunities will come up.
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Old 25th July 2013, 07:50 PM   #6
dangus is offline dangus  Canada
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Join Date: May 2004
Location: Vancouver Island
Code Practice Oscillator might bring up a simple transistor multivibrator; I think I used a circuit in an ARRL handbook.
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