Electronics > Beginners

Basic Function Generator help

<< < (6/6)

kulky64:
Try to adhere to regular color coding convention and use black color only for ground connections and nothing else. Now you have mix of black, blue, yellow and red colors in your ground node and your -9V node is all black. Sooner or later you probably blow something up when you will try to measure your signals with scope or frequency counter because you subconsciously connect ground lead to first black wire you spot on your breadboard.

MarkF:

--- Quote from: dcbrown73 on August 10, 2019, 06:14:20 pm ---I was poking around the circuit and measured the resistances way above expected on the voltage divider, so I moved the voltage divider away from the op amp and reconnected everything.  Now I get an (almost) perfect square wave and the pot controls the duty cycle.

Something was off about it, but it seems to be functioning perfectly now.   At least  I know I'm not crazy now...

--- End quote ---

The trim pot should adjust the frequency.  Not the duty cycle.

https://www.instructables.com/id/THE-SIMPLEST-FUNCTION-GENERATOR-BUILT-ON-A-BREADBO/

dcbrown73:

--- Quote from: MarkF on August 10, 2019, 07:06:06 pm ---
--- Quote from: dcbrown73 on August 10, 2019, 06:14:20 pm ---I was poking around the circuit and measured the resistances way above expected on the voltage divider, so I moved the voltage divider away from the op amp and reconnected everything.  Now I get an (almost) perfect square wave and the pot controls the duty cycle.

Something was off about it, but it seems to be functioning perfectly now.   At least  I know I'm not crazy now...

--- End quote ---

The trim pot should adjust the frequency.  Not the duty cycle.

https://www.instructables.com/id/THE-SIMPLEST-FUNCTION-GENERATOR-BUILT-ON-A-BREADBO/

--- End quote ---

Correct, what I was thinking and what I typed were two different things.

Navigation

[0] Message Index

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod