Build Your Own Clone Message Board

May I ask where you ordered your RC4558 and NE5532 ICs from? I have the same fizz and would love to clean it up.

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Tommy
Playing currently with Great Mutations and Kimono Dragons

Just a comment on the last few posts re: changing op amps in the Silver Pony:

It really shouldn't matter which general purpose op amp you install in the SP, since they're all compatible with that circuit and serve the same functions in it. So I would have no qualms about getting a couple more TL072's if my SP was "fizzing" like yours, since they continue to function well in hundreds of SP's. But if another type is your choice, go for it. In addition to the NE5532 and RC4558P, other compatible dual op amps include the JRC4558D (the long-time standard in Tube Screamers), RC4559P, TL082, OPA2134, LM833, LF353N and a couple more.

That said, we have seen a rash of IC related failures in the last couple of months, particularly with charge pumps....and the SP also contains one of them. I have not heard of a specific reason why this is happening, but there's a lot of speculation about pandemic-related supply/manufacturing issues and possible lapses in QA controls. I know these failures have had Keith tearing out his hair because of the customer problems & perceptions they've created. And BYOC will replace defective parts at no cost to you.

Something else you may want to try is to just swap the two op amps between their positions, since they serve different functions in the SP circuit. So it's very possible that the one causing the fizziness will function normally in the other position. Worth a try, certainly.

FWIW, Mouser.com is my "go to" place for these components. And make sure you're ordering the DIP-8 (or PDIP-8) form factor and not a surface-mount version!

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

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

thanks for that info.I will check out 'Mouser'.

Just so you know, I had bought addition TL072's at first, but they did not work either. Maybe they were bad? dunno. Anyway, I tried those other two options I listed and it worked. so weird. but I'll take it:)

I did try swapping the positions of the original TL072's like you had advised someone else to do on an earlier thread it did not seem to make a discernible difference in my case.

Anyway, you guys are awesome. I don't put any of the chip problems on Keith or the company. The support of Keith and this forum are top notch!

Here, here!

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Tommy
Playing currently with Great Mutations and Kimono Dragons

Duojet- when you say RC4558 in the IC1 slot and a NE5532 in the IC2 slot, is IC1 the very top socket on the PCB?

I ordered a NE5532AP, RC4558P, and RC4558PE4 which is what Mouser had.

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Tommy
Playing currently with Great Mutations and Kimono Dragons

IC2 is the uppermost socket position--see PCB map below. It makes sense to put the NE5532 there--it has a somewhat higher supply voltage spec (+/-22V) than the 4558, and IC2 is the position with the doubled voltage from the charge pump.

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

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

This did the trick. No more fizz and the pedal sounds great with the gain cranked or all the way down as a clean volume boost.

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Tommy
Playing currently with Great Mutations and Kimono Dragons

Excellent news! And I know Keith is watching this thread, too, based on the voltage-boosted TL072 problems reported of late.

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

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

I had this exact same issue with a silver pony 2. I went through 4 charge pumps before I placed an order through mouser. Solved the issue. It's been working awesome the past few weeks. Saw this thread thought I'd chime in.

great news! sorry I have been out. been a busy couple of weeks, work and taxes. glad you got it working:)

rock!

I have the same problem with fizz in my silver pony 2.1 I just built it this past week. I ordered my kit on March 14th. This is my first pedal build so I don't have any spare opamps laying around to try. I swapped the two opamps and the fizz is still there. Any chance I could get some replacements sent out or should I order some?

Everything else went great with the build, thanks for the help!

<edit> I went ahead and ordered a smattering of opamps from mouser just now. I couldn't wait for an answer, ha.

If you contact sales@buildyourownclone.com, they would get a new pair of op amps out to you at no cost and just as fast as Mouser can get them to you. Just sayin'....

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

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

In case it helps I took voltage readings with all 3 ICs inserted. If it would be useful to take them without the TL072s installed let me know and I can do that.

Are these the IC voltages before replacing the op amps?

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

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

Sorry I should have specified. I have not yet replaced them. I haven’t received the new ones I ordered yet.

The voltages all look fine. But the "fizz" isn't a voltage problem, it's a headroom issue. As I understand it, some of these recent production TL072 op amps apparently can't run in this duty with a charge pump without causing this unpleasant high frequency distortion. It's odd, because we never use to see this problem.

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

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

That’s interesting. My numbers show that the Vcc range is 28.2 which is within the max 30V stated on the data sheet for non “H” versions of TLO72. I wonder if using the H version would be safer solution since it supports Vcc range up to 40v giving more wiggle room in case there are some chip manufacturing issues or something (still makes no sense why this only recently started happing of course).

Peter

Let me know if I can run some over to you, fellow Rochesterian.

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Scott

My band, Austin Hollow

So the Vcc voltages on this schematic are a few volts less in each direction (16.2 and -8.6) than my measured values. Maybe i have some component values (within spec tolerances still perhaps) that are pushing the voltages higher (or more negative) feeding IC2? Just a complete guess but it is interesting the Vcc values are lower to me.

https://www.electrosmash.com/images/tec ... -Parts.png

Hahaha. Nice! Thanks for the offer but i can probably wait for my shipment. But if the new ones don’t work you can help me fix it.

Received my mouser shipment today of a few varieties of op amps. The first one i tried, a TL072IP, eliminated the fizz when I put it in the upper IC2 position that has the boosted Vcc voltage. So that’s pretty cool for me.

I ordered 4 types of op amps and 5 of each type. If it’s worth me trying more out to see if any of my new ones have the fizz issue let me know if that would help out in any way or if there is anything else i could do to try and help out.

Thanks!