Print Page - The Klon trick - where am I going wrong?

Title: The Klon trick - where am I going wrong?
Post by: james_shames on March 09, 2021, 01:54:50 PM

Hello everyone. I have a strange (an repeatable) problem. Every time I build a Klon power supply I cannot get the -9v at pin 5 of the 1044. I think I've tried a few 1044s, most recently a TC1044SCPA. The rail voltages on the second op-amp are +14v and 0v. I've tried breadboarding it, vero, PCBs, always the same issue.

Am I going mad?

Title: Re: The Klon trick - where am I going wrong?
Post by: tonyharker on March 09, 2021, 02:02:20 PM

Show us the schematic you used and pics of your assembly.

Title: Re: The Klon trick - where am I going wrong?
Post by: iainpunk on March 09, 2021, 02:06:46 PM

i'm not familiar with charge pumps etc, but try this:
debugging guide (https://www.diystompboxes.com/smfforum/index.php?topic=29816.0)
cheers, Iain

Title: Re: The Klon trick - where am I going wrong?
Post by: james_shames on March 10, 2021, 07:20:38 AM

Thanks for taking a look. Just breadboarded it again to take a photo and it works perfectly. I'm definitely going mad... :icon_redface:

Title: Re: The Klon trick - where am I going wrong?
Post by: r080 on March 10, 2021, 09:54:02 AM

You are not going mad.

I remember my engineering school labs had exactly 3 troubleshooting techniques that were successful for correcting breadboard problems:

1. Turn on the power supply
2. Connect the wires from the power supply
3. Rebuild everything, repeating 1 and 2 as necessary

DIYstompboxes.com

DIY Stompboxes => Building your own stompbox => Topic started by: james_shames on March 09, 2021, 01:54:50 PM