Tractor beam, high pitched sound when effect 0ff or on?

[Spenzerleehorton]

back with pots

[Spenzerleehorton]

switching pcb front

[Spenzerleehorton]

switching pcb back

[Spenzerleehorton]

right, ive just seen my mistake for the switching pcb, i had wired the screen to the output terminal!!
swapped and get signal now with effect off and see effect on signal.

Next step is getting the effected signal working!! it doesnt look good, will report back with some voltages and try and trace signal to see where it gets to.

[Spenzerleehorton]

I have ordered a C1meg pot which is reverse taper as the one I had broke!
The 3 way switch when in the middle I don't see any signal when mix fully CW.
When 3 way switch to left and right I get very messy waveform.
Speed pot does function asi can see the waveform change, feedback does seem to change waveform along with other pot does seem to do something.
Trim pots work, just need to check voltages on ic's to see if one has malfunctioned.

[Spenzerleehorton]

ok here some voltages:

switching pcb seems to be working fine now and was all along, i had just got mixed up with screen and signal!!

TLE2074
1 - 7.61* this is only meant to be 4mv so problem here!!
2 - 1.1mv
3 - 0.2mv
4 - 8.63v
5 - 0.3mv
6- -1.2mv
7 - 7.61v
8 - varies
9 - varies
10 - varies
11 - -8.22v
12 - 0.1mv
13 - varies
14 - -7.22v

2N5954 (x4)
D - 0.3mv
G - -3v (with some twiddling of bias trimmer i can get gate volatge down to -0.4v but not 4mv
S - 0.3mv

OPA2134
1 - -1.4mv
2 - -1.2mv
3 - 0.2mv
4 - -8.2v
5 - 0v
6 - 0.9mv
7 - varies
8 - 8.64v

V+ is 8.5v
V- is -7.72v

all help is appreciated

[Spenzerleehorton]

this is the waveform with 3 way switch at 2, i dont see any major movement in waveform apart from some little bits, i thought the waveform should pulsate?

[Spenzerleehorton]

this is with the 3 way switch at 3, as you can see the waveform looks all over the show!!!

[Spenzerleehorton]

this is with the switch at 4, chaos!!!

[Spenzerleehorton]

Could anyone help please with this?

[dan.schumaker]

It looks like pins 1&14 of the TLE2074 are causing some issue for you.  Do you have another you could sub in there? I know I have had issues with those chips in other builds where popping another in solved the wrong voltages.  I could be wrong, but you might be able to see if it is the chip by putting another quad op-amp in there (like TL074).

[Spenzerleehorton]

I think I have a TL074 so I'll try that, any other pointers?

[Spenzerleehorton]

I've put in a TL074 and it's slightly better but voltage now 0.625v on pin 1.
Waveform is pulsating a little now so it's better but still not right!!
When switching the phaser to 3 or 4 distorts waveform.
Any other ideas?

[Spenzerleehorton]

I must have been mistaken, and i had just got back from a 12 hour shift!!!

pin1 is 7v on TL074 so still way off, the unit makes a horrible distortion when plugged into an amp!!!!

i've changed the 2N5952 and no difference!!!

where is this 7v coming from!!!???

this pedal is turning into a bit of a headache!!

[Spenzerleehorton]

well looks like i'll just have to give up on this build!!!

OPA2134 voltages on pins 1-3 are wrong and Pin 1 of TL074 goes up and down from about 0.6v to 3v?

was so looking forward to building this phaser but its just done my head in now!!!