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Author Topic: Analog (or Simple Digital) Circuit to Generate Low Frequency Sound  (Read 1281 times)
R. K. Beetle
Deck Hand
United States United States

« on: May 19, 2017, 02:47:01 pm »

I have a prop that I want to generate a constant, low-decibel, low-frequency "hum". (Well, the best low frequency that a cheap hobby speaker can generate.)

I'd like to not use ICs, if possible, and I'd like it to be reasonably simple.

Bonus points . . .
  • if the frequency can be adjusted by a variable resistor
  • if the tone "warbles" a little
  • if the same circuit can be used to drive a flickering LED
Hektor Plasm
Zeppelin Captain
United Kingdom United Kingdom

All-Round Oddfellow.

« Reply #1 on: May 19, 2017, 06:40:04 pm »


Have a look for '555 circuits' on the Goog.
This chip is very versatile and can do all of the things you need, one way or another, with only a few extra components.


"all die! o, the embarrassment."
H Plasm Esq. ICUE    Avatar by and with kind permission of Dr Geof. Ta!!

Some musings:-
Prof Marvel
Zeppelin Captain
United States United States

learn from history, or be doomed to repeat it

« Reply #2 on: May 19, 2017, 10:24:46 pm »

Ask around for someone who received one of those "greeting cards with sound"  they usually throw them away eventually anyway.
take it apart and play with it. you'll find it has a memory chip with the song, you may be able to "diddle" it.

prof mvl

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