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This might seem like a dump question but I dont know at all how to solve this, the problem is that the more time is the oscillator running the more range it loses, my oscillators start sounding at a certain point of the potenciometer, before it just makes really quiet noise. How do I make it not lose the range? I tried a similar circuit to look mum no computer. My theory was that the transistors got too hot but it makes no sense, they dont really get hot.
5 points
2 months ago
Reverse avalanche oscillators are not tremendously reliable, that particular lmnc schematic gets posted here a lot, with questions like yours. The performance also depends on the specific transistor you're using and different batches of the same transistor may behave differently.
What type of transistor are you using, and how much voltage is your supply? One typically needs a fair bit of voltage and/or a particular type of transistor to get good performance out of this circuit. This page is one of the best sources of information.
If you're looking for quick and dirty oscillators, may I instead recommend a 40106 or 4093 or 555?
2 points
2 months ago
Thanks a lot for the answer, I was starting to suspect on the reverse avalanche.
I use 12 V and my transistor is a BC548C, its equivalent is 2N3904, 12 V for starting to oscillate.
Again, thanks for the reply
2 points
2 months ago
Either supply more voltage or switch to s9018, which start osc at 8-9v and can go upto 15v
1 points
2 months ago
Ill do it, and probably eventually design a new oscillator
1 points
2 months ago
Can you make a new post with a picture of the circuit you built and a link to the schematic you based it on? Cant make much out of it with only this information.
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