Comments on: Ding-Dong sound generator

By: admin

admin — Tue, 22 Feb 2011 05:24:58 +0000

C1 and C4 are 15V electrolytic capacitors. C2 and C3 are ceramic capacitors.

By: jack

jack — Mon, 21 Feb 2011 15:24:49 +0000

are c1, c2, c3 are milar capacitors?
if not, what are its corresponding voltage values? thnx!

By: Alan

Alan — Mon, 06 Dec 2010 07:46:54 +0000

Is this circuit supposed to make a “higher pitched DING, lower pitched DONG” sound like a doorbell? All I get is “beep beep beep beep beep beep” and I can use the variable resistors to change the length of time of the tones (long beep with a long pause, or very quick), and the other variable resistor to change the tone, higher or lower pitched. But all the tones are the same pitch. Or did I wire it wrong?

By: admin

admin — Thu, 11 Feb 2010 06:16:02 +0000

reply to rendy
My mistake. I have corrected the circuit diagram.

By: rendy

rendy — Tue, 09 Feb 2010 01:49:24 +0000

where is the (-) pole??

By: frank

frank — Sat, 23 Jan 2010 17:48:09 +0000

There should be a 100k resistor between pin 3 IC1 and pin 5 IC2…also you need a button for it to work like a doorbell