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PostPosted: Sun Apr 30, 2017 8:52 pm 
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Hello all
I just finished my soaring skillet and while I do get sound in bypass and with the effects engaged the sound does not contain any effect. Trim pots make very little change to the sound, but do make a slight difference, but more like a wah, not a phaser or tremolo. The wah does not oscillate but turning the trim pot does change the sound.

LEDs work, and the left right mid switch works.
here are the pin 1 voltages for my ICs
IC1 4.08
IC2 3.84
IC3 3.76
IC4 4.39
IC5 4.55

I am currently reflowing all my joints


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PostPosted: Sun Apr 30, 2017 8:59 pm 
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the topside of the board


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PostPosted: Tue May 02, 2017 6:01 pm 
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You should also verify that the 2N5952 and 2N3904 transistors are not mixed up.

Soldering generally looks pretty good, but the joints are pretty dull (sign of the iron tip not being hot or clean enough) and some joints look like they can use some more solder.

Here is a good example of what he solder joints should look like: http://www.byocelectronics.com/board/viewtopic.php?f=9&t=52211

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PostPosted: Tue May 02, 2017 7:56 pm 
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Thanks for the tip!

I started reflowing some suspect connections...and now the effect works...but does not oscillate


My pot pins look piss poor compared to the ones you posted!

I will touch them all up and see where I get then.



Thanks for the help


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PostPosted: Wed May 17, 2017 8:16 pm 
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Here is the latest
Turned up my soldering iron heat

Had the phaser voice and phaser bias trimpots backwards. Got those corrected

Had the faz rate and pan rate backwards, got those corrected

double checked the ICs, reflowed the solder on each component, and still got no effect for either the phaser or the pan other than to hear a fixed wah kind of tone when I adjust the phase voice trimpot.

The transistors are in the right places.

I just don't seem to get any more or less no matter what I find and correct or try.


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PostPosted: Thu May 18, 2017 11:43 am 
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I'd probably start by trying to get the panning circuit working first.

The two trim pots in the center adjust the panning bias. One trimmer (VR6) is for the left and the other (VR7) is for the right. You should be getting a fluctuating voltage on pin 7 either IC5b or IC4b that changes rate as you turn the panning speed knob.

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PostPosted: Thu May 18, 2017 5:17 pm 
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thanks! I will check that shortly and let you guys know what's up


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PostPosted: Thu May 18, 2017 8:40 pm 
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No fluctuating voltages on pin 7 of IC5b or IC4b when I turn the trimpot at VR6 or VR7


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PostPosted: Fri May 19, 2017 11:25 am 
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It appears you aren't getting any low frequency oscillation from IC5a. What are your voltage readings for IC5a? If you look at page 3 of the schematic, that bit of circuitry at the bottom of the page is the LFO (low frequency oscillator). IC5a is the actual oscillator. The LFO frequency is coming out of the junction at C23/R66. IC5b is just non-inverting buffer. IC4b in an inverting buffer, so it inverts the LFO phase. This is what creates the panning. It's just two out of phase tremolos.

Anyhow....I suspect you've got something amiss at or near IC5. Give us the voltage readings for IC5. Take a look to make sure everything looks good around that chip. Reflow the joints again around that chip. Check the voltage at C23/R66. You should have a fluctuating voltage here. You can find a PCB map for the soaring skillet here viewtopic.php?f=29&t=39393

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PostPosted: Fri May 19, 2017 3:22 pm 
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hesaias wrote:
still got no effect for either the phaser or the pan other than to hear a fixed wah kind of tone when I adjust the phase voice trimpot.

This sounds a lot like you're LFO for the phaser circuit is not working either, which seems a little odd. Once you've gone through what Keith laid out above, get voltage readings from the phaser LFO. R35 should have oscillating voltage.

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PostPosted: Sat May 20, 2017 9:03 pm 
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Success! Evidently, there was a bad solder connection (go figure) near IC5.

Its late here, so on to the phaser circuit tomorrow.

Thanks for the assistance guys!


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PostPosted: Sun May 21, 2017 4:22 pm 
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hesaias wrote:
Success! Evidently, there was a bad solder connection (go figure) near IC5.

Its late here, so on to the phaser circuit tomorrow.

Thanks for the assistance guys!

Fantastic!
I'm jonesing to build or buy one of these, what are your impressions of the sound?

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PostPosted: Wed May 24, 2017 7:12 pm 
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I spoke too soon.

I have no idea why it worked, but the next day, it went back to the same issue: no effect. LEDs work, left right both switch works, pan trimpots work, but no oscillation, knobs have zero impact on tone.

I have the voltages on all the ICs with the Pan switch engaged

IC1
4.1v 8.3v
4.1v 7.5v
4.1v 3.1v
0.0v 4.5v

IC2
4.0v 8.3v
4.1v 4.1v
4.0v 4.1v
0.0v 4.0v

IC3
4.1v 8.3v
4.1v 4.0v
4.0v 4.1v
0.0v 4.0v

IC4
4.6v 0.0v
4.4v 3.9v
4.3v 3.9v
8.3v 4.1v

IC5
4.6v 8.3v
4.6v 4.5v
4.5v 4.6v
0.0v 4.5v

They seem to be pretty much the same with the phaser engaged too


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PostPosted: Wed May 24, 2017 7:29 pm 
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Those all look good, assuming that you wrote the IC4 voltages in the reverse pin order....

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PostPosted: Thu May 25, 2017 12:17 pm 
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If it works one minute and then not the next, the problem is almost always an intermittent connection. That may be a cold solder joint. It may be that you don't have one or more of the ICs firmly seated in their sockets. viewtopic.php?f=29&t=39393 Take a look at schematic #3. Everything at the bottom of the page between R61 and R73 is part of the panning LFO. Your problem is in there somewhere. When the LFO is working, you'll have a fluctuating voltage on pin 5 of IC5b. Pull the ICs out. Put them back in. Look for scraps of frayed wire in the sockets. Go over the solder joints in this area with a fine toothed comb. Try swapping out ICs 1, 2, and 3, with 5.

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