Voltage to frequency converter

[Dust]

I have a 0-5V signal that I would like to convert to a negative pulse. Wanting to mimic a fuel injector, but it doesn't need much power behind it. The signal will control an injector. I have searched online but I can't make sense of the diagrams, so I am just looking to buy one already made. Where should I be looking? What should I be looking at paying?

[Ryland]

sounds like you need a 555 timer, search for that and you should turn up something.

[JasonG]

I agree with the above. The 555 is a very basic chip that does tons more than it is given credit for.

I think Vellman sells a few 555 PWM kits. You may need to swap the inputs to make them go negative.

I can make you a diagram if you know what durations you will need.

[Dust]

Jason, I need it to echo or simulate fuel injectors.

[JasonG]

That is like saying you need a car with wheels.

What frequency pulse ?
What duration ?
What ratio of high to low ?

If 555 schematics are too much, I really reccommend getting a Velman. Easy to solder, some are prebuilt....... K8004: VELLEMAN INC.: Education & Hobby they list it as a Expert kit........
If you can use a knob this QKits Electronic Kits: MX033, PWM DC Motor Speed Control Module will work. It is also possible to replace the variable resistor with your 0-5V signal.