Author Topic: Solaris Fuzz  (Read 6424 times)

rpark71

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Re: Solaris Fuzz
« Reply #15 on: August 30, 2021, 06:04:23 AM »
Hi again - can I ask about the audio probe path? Should you get signal on either side of component or just one side, where you see the track of the pcb? I think the issue is on Q1 collector as that's first point on path that has no signal, but have tried re-soldering but still without signal from looper pedal. I get a signal on the base pin but not emitter or collector, and I see the collector goes to CX4, where there's also no signal. I have transistor sockets - could that be defunct - assume they can't be wrong way round?

I notice that when I put audio probe on Q1 collector pin the signal (amp) noise goes dead, like something is shorting out? Bit stuck on what to do next?
« Last Edit: August 30, 2021, 06:11:31 AM by rpark71 »

Zerro

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Re: Solaris Fuzz
« Reply #16 on: August 30, 2021, 06:30:25 AM »
Now controll R3 and FUZZ pot (1k) and that capacitor C2 (22uF) with it.
"Nudíte se? Kupte si našeho cvičeného ježka! Pobaví vás svými veselýmí kousky!"

rpark71

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Re: Solaris Fuzz
« Reply #17 on: August 30, 2021, 07:22:43 AM »
Thanks Zerro - not sure what you mean control them, but with audio probe signal comes through on R3, but goes quiet (no amp hum) on Fuzz pot or on C2. Does this help?

jimilee

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Re: Solaris Fuzz
« Reply #18 on: August 30, 2021, 07:54:20 AM »
Two things, check the orientation of the transistor, the note says reverse for npn. Second, look at the back of the board for shorts to ground or solder bridges.
Pedal building is like the opposite of sex.  All the fun stuff happens before you get in the box.

Zerro

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Re: Solaris Fuzz
« Reply #19 on: August 30, 2021, 08:24:31 AM »
Seems ok. Now measure DC value at collector of output tranzistor.
"Nudíte se? Kupte si našeho cvičeného ježka! Pobaví vás svými veselýmí kousky!"

rpark71

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Re: Solaris Fuzz
« Reply #20 on: August 30, 2021, 08:57:58 AM »
Ok, will check again for solder bridges... I'm using PNP transistors, as needed as I used the IC part of the circuit - I didn't understand this wasn't required if using NPN.

DC value of Q2 transistor on the collector pin is 9.76v

Zerro

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Re: Solaris Fuzz
« Reply #21 on: August 30, 2021, 09:34:57 AM »
9,8 V seems to me too much. Q2 is not opened properly = Q1 is too closed. Or emitor of Q2 is hanging off, not connected properly with ground by that pot 1k. It is about feedback via those resistors and pots I asked before. And about resistor in collector of Q1. Measure voltage at Q1 collector.

BTW what is power supply value?
« Last Edit: August 30, 2021, 09:42:57 AM by Zerro »
"Nudíte se? Kupte si našeho cvičeného ježka! Pobaví vás svými veselýmí kousky!"

rpark71

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Re: Solaris Fuzz
« Reply #22 on: August 31, 2021, 05:09:24 AM »
Hi Zerro - thanks again for any help. Watched a video on voltages when things aren't working...and said to supply following to anyone trying to help!

DC jack lug 9.42v
9v pad on board 9.42v
IN/OUT pads on board and on footswtich lugs both read 0v (I suspect that's not right?)

IC chip:
Pin1 9.42v
Pin2 5.52v
Pin3 0v
Pin4 -3.38v
Pin5 -9.4v
Pin6 4.64v
Pin7 6.18v
Pin8 9.42v

Q1 transistor: E 0v  B -0.33v  C -1v
Q2 transistor: E -0.33v  B -1v  C -0.34v

thanks, Rich


Zerro

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Re: Solaris Fuzz
« Reply #23 on: August 31, 2021, 07:33:07 AM »
Hi, at first reading you find at collector Q2 on -9,7V. Now it is -0.34V? What changed?
"Nudíte se? Kupte si našeho cvičeného ježka! Pobaví vás svými veselýmí kousky!"

rpark71

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Re: Solaris Fuzz
« Reply #24 on: August 31, 2021, 09:21:41 AM »
Ah, meant to add that yes I noticed the difference. Sorry - Human error is what's changed.

Originally I was placing red probe on DC positive lug and and black on the collector of Q2, which gets 9.76v. After watching video on voltages I put clip onto black probe and then connected other end of clip to ground on pedal (enclosure) and took measurements, which gave readings sent.

Zerro

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Re: Solaris Fuzz
« Reply #25 on: August 31, 2021, 09:45:46 AM »
Don't know video you saw, but power values are measured against ground. Minus pole (mostly black wire) of your multimeter put at ground, and red use for measuring. That's what gives proper infos. Try to do it this way and send values at transistors.
"Nudíte se? Kupte si našeho cvičeného ježka! Pobaví vás svými veselýmí kousky!"

rpark71

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Re: Solaris Fuzz
« Reply #26 on: August 31, 2021, 10:26:38 AM »
Yep, black probe on ground lug of DC jack and red on transistor legs:

Q1 transistor: E 0v  B -0.33v  C -1v
Q2 transistor: E -0.33v  B -1v  C -0.34v

On the base of Q2, I do seem to get fluctuating readings - sometimes 0v, sometimes -1v. ??

Zerro

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Re: Solaris Fuzz
« Reply #27 on: August 31, 2021, 01:16:41 PM »
Circumstances around Q2 are bad. If at basis is only 1V, at collector cannot be so low power. Controll this element and collector resistors aiming up to power console.
"Nudíte se? Kupte si našeho cvičeného ježka! Pobaví vás svými veselýmí kousky!"

Bio77

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Re: Solaris Fuzz
« Reply #28 on: August 31, 2021, 02:29:54 PM »
Are those trimmers meant to adjust the bias on the transistors?

Zerro

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Re: Solaris Fuzz
« Reply #29 on: August 31, 2021, 02:44:44 PM »
Only trimmer BIAS sets something similar. Other Pots are setting some sound charcteristics. But in this case is something wrong around Q1. At collector of Q2 must be something about -5V DC.
"Nudíte se? Kupte si našeho cvičeného ježka! Pobaví vás svými veselýmí kousky!"