Negative and positivepulses generation !!!

[bijaypaudel]

Here's the problem:

the pulses are for providing Gate signal to GTO....
i have used two ports from microcontroller(pic16f877) as outputs RC1 and RC2, and they are connected to a circuit that gives single output line.
the circuit should give output 0v when Rc1=0 and +5v or -5v when RC1=0 as per value of RC2(0,1)...
can charge pump circuit can be interfaced with uc to get requirement!!!!

 

[BradtheRad]

This converter will accept positive pulses and output a constant negative volt level.

Screenshot:



A 555 timer IC is shown generating the pulse train, but you can use a different method including your microcontroller.

Component values are not critical.

If you find -3.7 V is not low enough, you can add a voltage doubler.