Author Topic: PT2399 Not Adding Delay  (Read 331 times)

dobo2001

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PT2399 Not Adding Delay
« on: May 30, 2018, 07:47:54 PM »
 So I'm finishing up the Deep Blue Delay from Aion, and I can get the delay to work. The pedal passes signal fine, but when the pedal is on there's no delay effect. Schematic https://aionelectronics.com/wp-content/uploads/2017/11/aion-vector-deep-blue-delay-documentation.pdf

I've tested the Delay in at pin 15, and there's signal going into the IC. At pins 8 and 9, there's just a popping sound. Maybe this is the problem?

The IC is receiving 5V at pin 1, and I've swapped out the PT2399 to no avail. Pin 6 to Ground is measuring ~41K Ohms. Is this the problem? Maybe someone else can help? Thanks!




WormBoy

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Re: PT2399 Not Adding Delay
« Reply #1 on: May 31, 2018, 09:14:49 AM »
Why have you been listening to pin 8 and 9? Don't know what should be heard there ... Perhaps listen at pin 12 and 14, but I would first listen at pin 3 and 2 of the mix pot (if there is delay there, that will narrow the problem area down considerably). Pin 6 to ground sets delay time, and depends on where you set the delay pot (2k7 to 52k7, so 41k looks fine).

dobo2001

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Re: PT2399 Not Adding Delay
« Reply #2 on: June 13, 2018, 08:38:36 PM »
Why have you been listening to pin 8 and 9? Don't know what should be heard there ... Perhaps listen at pin 12 and 14, but I would first listen at pin 3 and 2 of the mix pot (if there is delay there, that will narrow the problem area down considerably). Pin 6 to ground sets delay time, and depends on where you set the delay pot (2k7 to 52k7, so 41k looks fine).

Nothing at 12 or 14, and nothing at the mix pot.

WormBoy

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Re: PT2399 Not Adding Delay
« Reply #3 on: June 14, 2018, 04:28:21 AM »
Hmm, it seems the PT2399 chip is not working as it should as there is sound going in but not out. The chip is getting 5V on pin 1, but one thing to check is that pin 3 and 4 are connected to ground. Next, I would check your soldering on the IC socket and on the components directly attached to the IC. Since you already swapped the chip to no avail, it seems you can rule out a faulty IC (unless you got both from the same suspect supplier).

I am certainly no specialist on these delays, so perhaps somebody else can come up with a better strategy for debugging.

dobo2001

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Re: PT2399 Not Adding Delay
« Reply #4 on: June 14, 2018, 01:27:05 PM »
Hmm, it seems the PT2399 chip is not working as it should as there is sound going in but not out. The chip is getting 5V on pin 1, but one thing to check is that pin 3 and 4 are connected to ground. Next, I would check your soldering on the IC socket and on the components directly attached to the IC. Since you already swapped the chip to no avail, it seems you can rule out a faulty IC (unless you got both from the same suspect supplier).

I am certainly no specialist on these delays, so perhaps somebody else can come up with a better strategy for debugging.

Reflowed everything around the chip. Both of them were from Small Bear so I assume they're good. 3 and 4 are both connected to the ground, tested the continuity.