Self driven Piezo circuit..

Thread Starter

pradeep_1993

Joined Feb 27, 2016
10
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 transistorsPiezo Self driven.PNG
 

Thread Starter

pradeep_1993

Joined Feb 27, 2016
10
The feedback is connected to the base.
At first i thought so too...searched as many projects as i could..
all seemed to connect the feedback to the base...but this was not the case in my project...
my feedback is connected to the emitter...hence i dont know how this is working
 

AnalogKid

Joined Aug 1, 2013
8,487
Are you sure the circuit works as drawn? The circuit and schematic had to come from someone. Can you ask that person how the circuit is supposed to operate?

ak
 

Thread Starter

pradeep_1993

Joined Feb 27, 2016
10
Are you sure the circuit works as drawn? The circuit and schematic had to come from someone. Can you ask that person how the circuit is supposed to operate?

ak
Yes...im a 100% sure the circuit is this way...
i am not able to contact the person...
but id like to know how this would work...iv seen the project working...
there must be some logic something or the other that v r skipping...
 

Thread Starter

pradeep_1993

Joined Feb 27, 2016
10
In your circuit, the feedback is connected TO THE BASE.

How many times do I have to tell you.
Plz see this image...Youll need to download datasheet of WCP56 to understand whis terminals is base collector and emitter...
the tracks are visible...im sure youll find which leads where.
S is feedback
R is supply
B is ground
 

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