I just completed the Tonepad Phase 45, and like my other projects, it doesn't work.
Voltage readings seem normal--4.5-ish from most transistors and pins, except the one pin that fluctuates in voltage (from phase effect, mebbe?)
However, I get no sound and it does not BYPASS. My first wiring for it was a simple TB DPDT switch confirguration. Nothing. Then I tried a more GGG-style 3PDT switch/LED/DC adapter jack. Still nothing, on or off. LED lights up though, and it's getting power.
Suggestions?
Jest a Suggest...
I always try my circuits without jacks and true bypass, using a test jig platform. I used to use just clip wires.
I'd work on getting the final part of the circuit to having contiinuity with the ouput first, then the input.
Then I'd use the 'thumbuzz' or audio probe method to work from the ouput to the middle or input to see where the signal is getting lost [powered circuit]
and or connect a signal source to the input and audio probe your way toward the middle then output to see where signal is getting lost.
I just built it and fixed some obvious errors. Have just started really trying to de-bug it.
My thumb creates a buzz on the board, but the only noise I get from the audio probe is popping when I touch it to the DC jack. Let's see if I got the audio probe right--I plug a guitar into the input jack of the effect, plug the audio probe into the amp and test the circuit that way, right?
Correct. You just connect it at various points along the circuit to find out where the sound stops.
Love your band, BTW. :twisted:
1st you've got the switch wired wrong or you would have sound with it bypassed. Try it again & see if you can @ least get the bypassed sound. Till you get that there's no need to even try with the circuit yet.
Once you get it bypassing:
I hope you've got the JFets socketed. If you do, pull them and see if you've got sound. If you do have sound then you have the JFets in backward. The Tonepad layout is reversed if you use 2N5952, but correct if you use 2N5457 or J201 or similar. (http://www.tributecity.com/forums/images/smiles/infinity.gif)
RDV
STILL not bypassing. I re-wired it with this simple layout from GGG w/a DPDT switch:
http://www.generalguitargadgets.com/v2/diagrams/switch_lo_dpdt_std.gif
It pops when engaged, I get a faint buzzing when I touch the output jack, and pops loudly when I install the battery.
Suggestions?
Either your switch is bad or you have it wired wrong.
RDV
You should be at least getting some sound when bypassed.
I think I'm going to build the Phase 45 next. Well, sometime in the somewhat near future. I have been focusing on practicing more for the last couple of weeks and I can sure tell a difference in my playing. :shock:
i think the easiest way to check if the switch is bad is to just jumper from where the input (from jack) goes to switch to the output (to jack) goes. if you get sound - either you've probably made a really silly mistake that will take 2 minutes to fix (but take 3 hours to spot :? ), or the switch is bad.
if you still dont get sound - i'd say you've got a problem in your jack wiring, or you've grounded the input or output signal somewhere.
something i know ive done too many times to want to recall is think the ground wire from the jack is actually the signal wire (as a result i now double and triple check that when i wire jacks they're right - also using blue wire for everything ground oriented.
hope it works out for you, the phase 45 is very nice. subtle by itself, or cranking lead tones with a distortion *in front* of it.
trent
I suspect it to be the wiring--I've hooked up a DPDT and a 3PDT switch with the same results--nada signal.
I'm going to try completely re-wiring it, possibly with a new input jack. Maybe I damaged the wire somehow, or something weird but simple.
I would set and hand draw the Schematic off of the Biginner's forum until i understood what? why? & where i was doing this, if i saw a connection on the bypass circuit i did not understand i would be asking question's on here to get answers, first off if you don;t have patience to do this your wasting your time rushing through this stuff, it will only have a lot of mistakes that will frustrate you and maybe cause you to give up on building your own pedal's which i find to be very gratifying, so slow down and learn the circuit your wireing, don't be afraid to ask when you don't understand a certian function, Building pedal's can be very much fun, or very frustrating, hope you can get your bypass working, if there is a certian part of it you don't understad there are lot's of guy's here that can explain it to you, and remember, there are threads on the beginner's page on this same problem if you'll take time to read them
Lonestarjohnny