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actuall i've got the signal from PIC which is a square wave 0-5V and its frequency is 50 hz and the pulse width is 100 micro second...and because the ouput current from PIC is small therefore i want to amplify the current...but get the same signal as before...will the circuit that u gave me do that?thank you for your reply
You still don't give any idea of what you want? - the small circuit as shown will do what you ask, but may not do what you want?. We don't care about the PIC side, we all know what that does - what we need to know is EXACTLY what you're trying to feed from it.
I'm building a digital calibrator for partial discharge system...Therefore, this pulse that i want to amplfiy the current will be feed to capacitor and feed to the partial discharge system..Is it clear enough? sorry for making confusion here
Not really, notice in the circuit above the load is connected between the collector of the transistor and the +ve supply - is your load able to be connected in that way?, and is the supply voltage high enough to do what you require?.
hi,
First you need a PNP transistor that is rated at least 200mA continous current. Iwould say 500mA
The Rcc series emitter resistor has to be rated also for at least 200mA.
If for example you had a Rcc = 10R , the emitter voltage with respect to the +V rail would be about 2V.
If you allowed for a Vbe of say 0.7V then the voltage on the base wrt +V would have to be 2.7V ie: the Vref =2.7V
If you used a standard Vref ic say 2.5Vref then you will have to adjust the value of Rcc to [2.5-0.7]/.2 = 9R
Of course the resistance the CC is flowing into must NOT cause a voltage drop greater than the +Vsupply and the Ve wrt +V.
This means if you have a +12V supply and the Vce= 2.6V, assume saturation
Rload = 9.4V/0.2 << 47R
Hi everyone , I have a question , I am working on my final year project I am using PLC's to represent a temperature control system . I am using helogen lights as a heat source but the PLC output is in the range of 4 - 20 mA and the helogen light requires 4 to 5 Amps. I need to amplify the current using a transistor. Can anyone show me or tell me where i can find relevant examples ?? thank you
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