Build Your Own Clone Message Board

I just completed my analog delay. There is no difference in the sound with the switch on or off. LED works. The dry side works fine with the IC’s removed and turned on and off. With the IC’s in the trim pots and control do nothing. It sounds the same on or off. Adjusting the pots and knobs does nothing. I will post pictures tomorrow and am on the process of checking all resistor values as well as polarity. I’m wondering if anybody was any quick checks or ideas. Thank you!

Pics would be the best place to start

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Please do not PM me. email is prefered. keith@buildyourownclone.com

Pics. Solder side to follow

Solder side

A lot of your solder joints look incomplete. Please go through and reflow all your solder joints.

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Reflowed

No change

Please take voltage readings of the V3205, V3102, and V571 chips.

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Voltages

Am I correct in assuming that you're using a battery and not a DC adapter power supply? You're voltages look correct in so much as they are proportionate to your supply voltage. However your supply voltage is a bit low, which is indicative of a dying battery. And while this doesn't have a huge effect on the 4558 chip and your dry signal, and the V3205 can operate with as little as 5VDC, the V3205 still has a relatively current draw. So, the short version is please try a fresh battery.

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Please do not PM me. email is prefered. keith@buildyourownclone.com

Strange readings on your ground connections. 570 pin 4, 3205 pin 1, 3102 pin 3, and 4558 pin 4 are all ground connections, should all be connected to each other, and should all have the same voltage readings, which should be very close to 0.0 volts. You've reported ground readings of 0.6, 1.5, 1.5, and 1.8.

If this were my build, I would check continuity of all the ground connections on the board and the jacks, reflow all of those ground connections, and see if I can find something that changes those weird voltages. There is also a good amount of flux on the solder side of the PCB; I would clean as much of that off as I could using some alcohol.

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MasterDelayer/Reverbrador/Ampaholic/TopJacker

9v power supply voltages in red using an AC power adapter

Reflowed and checked the continuity. All appears grounds confirmed

Cleaned as well then checked the voltages after the reflow and cleaning

Thank you for your help. Can someone point me in the right direction to find the Pcb and schematic for this version (2.1). Thanks

Yeah, Morgan is correct. I spoke too soon when I said your voltages look good. Your ground points suggest one of two things. You've got a short somewhere. Or you're simply not taking the readings correctly. As Morgan pointed out, pin 4 of the 571, pin 3 of the 3102, pin 1 of the 3205, and pin 4 of the 4558 are all physically connected by a common trace. Further more, this trace is connected to ground. So it should be reading 0V. At the very least, all 4 of these pins should be measuring exactly the same.

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You can use the schematic/layout here. http://www.byocelectronics.com/board/viewtopic.php?f=20&t=39391 There's an extra 10k resistor added between C13 and pin 7 of the 3205, which isn't on there, and is the difference between 2.1 and 2.0, but that shouldn't make it so you can't use the 2.0 schematic.

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Perfect. I have been using 2.0. Thank you

Follow that link and scroll down. It will take you to a map of the PCB if that's helpful.

I think your first concern however, should be figuring out why you don't appear to have continuity between pin 4 of the 571 and the rest of the IC grounds. And also what you're shorting out against to cause a significant voltage reading at the other IC grounds.

Maybe try taking all the ICs out of their sockets and measuring again in case one of the ICs has an internal short.

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IC’s removed

Now put the ICs back in one at a time, taking voltage readings each time, to determine which one is causing voltage at ground.

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Please do not PM me. email is prefered. keith@buildyourownclone.com

4558 replaced. Pin 4 reads 1.6.
570 no chip in place pin 4 reads .9
3205 socket (no chip) pin 1 reads 1.3
3102 socket (no chip) pin 3 reads 1.3

Should I continue replacing or is 4558 the culprit?

You should at least check the other chips while you're at it. I would be hesitant to blame the 4558 because that is the chip that is creating your dry "on" signal. If the 4558 wasn't working, you wouldn't hear anything at all when you engaged the pedal.

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*patience is a virtue*

Please do not PM me. email is prefered. keith@buildyourownclone.com

570 in 4 pin 1.0
4558 4 pin 1.1
3205 1 pin 1.1
3102 3 pin 1.1

3102 in 3 pin .6
4558 .6
3205 .6
570 .5

3205 in 1 pin .4
3102 .4
4558 .4
570 .4

You seem to have some sort of short somewhere. It's very minor, so perhaps is a dielectric short caused by the solder flux. You should get some isopropyl alcohol and clean off your PCB. If that doesn't help, the next step will be to trace out your wet signal path with a signal probe.

_________________
*patience is a virtue*

Please do not PM me. email is prefered. keith@buildyourownclone.com

Thank you for the help. I have cleaned the pcb and started a signal trace. Signal into 4558 is good and output at pin 1 is as well. I continued testing at 4558 there is no output at pin 7 on or off.