Build Your Own Clone Message Board

Hi there. I did check all my solder joints and I'm powering the Silver Pony with a new 9v battery. Both TL072's voltages are good. The 7660 charge pump voltages are not correct:
Pins:
1: 9.25v
2: 4.64v
3: 0v
4: -4.55v
5: -9.17v
6: 4.69v
7:7.26v
8: 9.25v

Can anyone tell me if the 7660 is bad? The Level & Tone controls work with no issues. Any help would be great! Thank you!!

Those voltages look right on the money for a charge pump running on a 9V power source.

What is the Silver Pony doing that you don't think is normal?

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

I forgot to mention my issue...lol. The Drive pot does nothing. The Level & Tone controls work fine....just no Drive. Any thoughts.??? Thank you!!

Do you have a multimeter and know how to measure resistance with it?

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

Yes. No problem.

OK, try these measurements:

On the dual-gang Gain pot, set it to the midpoint and then measure these things on each of the two sets of legs (measure on the solder joints on top of the PCB):

• Resistance between the two outside legs.
• Resistance between the left and center legs.
• Resistance between the right and center legs.

Also measure the resistance between pins 1 & 2 of IC1 (see PCB map below). Pin 1 is the square solder pad and 2 in immediately below it.

Report your results here.

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

Top 3 lugs of dual pot:
Outside lugs= 1.46k
Left to center lug= 19.3k
Center to right lug= 19.4k

Bottom 3 lugs of dual pot:
Outside lugs= 84.2k
Left to center lug= 58.19k
Center to right lug= 28.12k

Pins 1 & 2 of IC1= 0.4 ohms.

Your results on the dual gang pot compare very closely with what I see on my own fully functional SP. (I was obviously incorrect on my initial expectations and have deleted those values so as not to mislead someone else reading this thread.)

The pin numbers for IC1 are apparently incorrect on the schematic (IC1a and IC1b are switched), so please measure the resistance between pins 6 & 7 and report your result here.

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

Pins 6 & 7= 424.8k ohms. Same reading with the TL072 installed or removed. Thank you!!!

OK, that's right on the money.

Time to see some photos of the build, please. They need to be LARGE, well-lit, well-focused shots of BOTH sides of the PCB and all of the jack and switch wiring. You can post them to a publicly accessible hosting site and display or link them here, or post them directly here using the forum's file attachment function (found below the main posting text box). If you use the latter, know that there is a 1 Mb size limit for image files, so it may be necessary to reduce their dimensions or their color depth to get them below that size limit. Any of a number of image editing applications will allow you to do this. I often recommend IrfanView for this purpose, since it is free and very easy to use.

Couple of follow-up questions:

Does the Drive pot affect output volume at all?

When you tightened down the Drive pot mounting nut, did you notice any unusual resistance or was the pot shaft not perfectly perpendicular to the top of the enclosure? The nut should turn freely until the last fraction of a turn when it snugs up.

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

The Drive pot doesn't really affect the output but sounds a slight bit louder at 12 o'clock. Turning all the way clockwise and counter-clockwise makes the sound a little sort of weaker or thinner....but only slightly.

All three pots slide into the chassis holes easily with no resistance. I also have a thin piece of cloth tape on the bottom of the Drive pot to protect from shorting out. The Drive pot with tape doesn't even touch the board so it's not like the tape is conductive. I'll get the pics asap. Thank you!

Just to be thorough...how exactly did you determine this and what voltage values did you obtain?

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

There is a voltage chart in this thread that I think you posted: viewtopic.php?f=50&t=59900&hilit=silver+pony+charge+pump

Other side.

OK, I don't see any component misplacements but there are definitely a couple of questionable solder joints. See marked up photo below. The two eyelets I've circled both appear to have no solder applied. Please do so and then recheck the pedal.

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

OK, good. That's what I was hoping you did.

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

Let me know what you think of the photos. Thank you!!

Did you see my response here?

viewtopic.php?p=503240#p503240

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2

No, I missed your response. I can't believe I missed those two solder joints. I guess when I was looking at the board I didn't think a parts lead when in that solder pad. My stupid mistake!!! Anyway, the pedal works and sounds good. I have to play with it and really see what it does. Thank you very much for helping me!!!!!

Yeah, when I saw those, I thought that was probably the problem. Another great example of why we almost always request to see photos. Enjoy the new pedal.

_________________
“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2