By "transistor" do you mean "diode" 1N4001...D1? Almost any diode would work...but I would suggest one in the with a voltage rating =/> 50V and a current rating of =/> 500mA.Any transistor would work there, or is the 1N4001 specific to this sort of issue?
Again it would dependent on how much current the buzzer requires. By the way, what opto-coupler are you using?Also, if i just needed an electronic switch to activate a buzzer, an optocoupler is good for that, right?
R2 pulls the base of the PNP transistor high (to +12V) to assure thar the transistor is "off" and not susceptible to noise when the opto's transistor is off. R3 limits base current to an acceptable value when the opto's transistor is "on" essentially shorting its collector to ground. Google for: transistor tutorial.Also, waht is the purpose of the contained resistors? I really would like to udnerstand the circuit, not just implement it.
I am using the schematic you posted. Same values. 10 k from emitter to optocoupler, and 4.7 k from base to optocoupler.
I have played around with it some, and only succeeded in ruining two transistors and a few optocouplers. So I came back to the original design, so far it being the only working one, and have the same overheating problem, as well as one I did not notice before- the motor runs without the optocoupler being activated. And I can't seem to figure out why. Any ideas? Thanks for your help thus far. It has been incredibly valuable.
The optocoupler is is an LTV827, and the transistor is a BC640. The opto is transistor based, (not triac) and the transistor is a PNP. I'm not sure what information you want specifically.
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