Self driven piezo

Electronika.design · Mar 15, 2016

piezo red- supply
piezo black- ground
piezo blue- feedback
most of the times the feedback is connected to base of the transistor...but here it is connected to emitter...
cannot understand the configuration...
the purple lines describe the outputs coming from timer 555 to activate the transistors

AnalogKid · Mar 15, 2016

Hard to say without more information. I agree, the feedback connection usually is a high impedance if the circuit is self-oscillating. Can you show more of the overall circuit?

ak

audioguru · Mar 15, 2016

A simple piezo beeper is wired like this:

Electronika.design · Mar 15, 2016

i would have shown the ckt..if i could have
but it wont matter...the transistors are getting activated by the 555 timer ics
I dont understand why an INDUCTOR is connected along emitter...any clue???

alec_t · Mar 16, 2016

Electronika.design said:
piezo black- ground

That's not what your schematic shows.

Electronika.design · Mar 16, 2016

alec_t said:
That's not what your schematic shows.

What do u think sir??
how would my schematic work then???

DerStrom8 · Mar 16, 2016

Where did you get this schematic? It's absolutely HORRID!

alec_t · Mar 16, 2016

Electronika.design said:
how would my schematic work then???

I don't see how it can, if black is grounded, since the junction of R22 and R23 would then also be grounded .

Self driven piezo

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