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 Post subject: Another Signal Injector Pen, OSCIL-O-PEN
PostPosted: Oct Fri 09, 2015 7:44 pm 
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Was given this by a friend still in the original box, shipping was 9 cents! It is from 1955. It didn't work and I first thought it was one of those transistor units like the Mosquito but that would be early use for 1955. So I was able to open it up and found a tiny buzzer. Just needed to dress the contacts with some 1000 sandpaper. Works good, fundamental is around 1000 cps but goes well into RF. Tried it on an AA5 and went right from antenna, IF and audio. Came with a 6 page instruction manual.
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 Post subject: Re: Another Signal Injector Pen, OSCIL-O-PEN
PostPosted: Oct Sat 10, 2015 9:31 pm 
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That is interesting! Does it have a schematic?

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I like things that light up, tubes, bulbs, LEDs, whatever, and things that make noise.


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 Post subject: Re: Another Signal Injector Pen, OSCIL-O-PEN
PostPosted: Oct Sat 10, 2015 10:43 pm 
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None needed, just a buzzer that operates at 1000 cps and produces lots of harmonics.


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 Post subject: Re: Another Signal Injector Pen, OSCIL-O-PEN
PostPosted: Oct Sat 10, 2015 11:35 pm 
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Sometimes the simplest circuits can do as good a job as more complex things.

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I like things that light up, tubes, bulbs, LEDs, whatever, and things that make noise.


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 Post subject: Re: Another Signal Injector Pen, OSCIL-O-PEN
PostPosted: Oct Mon 12, 2015 2:20 am 
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Some crystal receivers had a buzzer circuit attached to allow you to find the hot spot on the detector crystal, as it was broadband in nature. That thing could serve the purpose if you ever mess around with galena detectors in antique radios.


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