Print Page - Problems with a PT2399 delay project

Title: Problems with a PT2399 delay project
Post by: MarkL on February 11, 2015, 03:15:08 PM

I received a PCB (not a MBD project) for a PT2399 delay. I populated it and powered it up. For about 2 seconds, it passed a signal with repeats....then stopped working. I replaced the regulator (78L05), put in a new PT2399, and the same thing happened.

I took voltages on every pin of the 2399 -- and got 0.0 on every one. Anybody know where something is going wrong here just from this info?

Title: Re: Problems with a PT2399 delay project
Post by: Luke51411 on February 11, 2015, 03:37:54 PM

More info is needed, first of all what circuit is it? A link to a schematic or build doc would be good. Read the debug thread here. Check for bad solder joints/bridges. Check continuity for power and ground.What are the voltages at the regulator? Photos of both sides of the board could be helpful as well.

Title: Re: Problems with a PT2399 delay project
Post by: TNblueshawk on February 11, 2015, 09:05:29 PM

Any chance the PT's are from Tayda? If they are and you have more pop in a few more just to rule that angle out real quick.

Title: Re: Problems with a PT2399 delay project
Post by: pickdropper on February 11, 2015, 09:12:03 PM

Is the digital ground and audio ground on the chip tied together? I believe those are pins 3 and 4. I would check that.

Title: Re: Problems with a PT2399 delay project
Post by: gtr2 on February 11, 2015, 11:33:04 PM

Schematic?

Title: Re: Problems with a PT2399 delay project
Post by: MarkL on February 15, 2015, 11:06:13 PM

Nevermind...fixed it. Chip installed upside down. Mea Culpa.

madbeanpedals::forum

Projects => General Questions => Topic started by: MarkL on February 11, 2015, 03:15:08 PM