Voltage conversion and pulse stream detection.

[adigwe]

Hi there, I need some help.

I have a sample and hold circuit comprising a TL071 opamp and capacitors. My output turns out to be a pulse whose mark(high) is 9v( Vsupply to opamp is 9V).

How do I convert the pulse to a 5V mark(high pulse). Or better still is it posible to have a response such that when the pulse is running the circuit reads high and when the pulse stops it goes low.

I just want to know if there is a method of detecting a pulse stream that is not too complex and if you can modify it to any voltage level say TTL.

Hoping to hear from you all.

Thanks.

 

[sunking]

use res to devide the output voltage

 

[IanP]

You can use 1kΩ resistor + 4.7V zener diode to limit the level and a CMOS Schmitt Trigger gate(s) (74HCT14, for example) to sharpen the edges and produce nice TTL/CMOS output ..

Regards,
IanP

 

[adigwe]

Hello guys, Thank you very much.

IanP yours is a most beautiful solution. Very creative.

Thanks everyone. I really appreciate.