ABDUCTOR II DELAY.

[deadastronaut]

Nope....there is plenty of adjustment on the individual delay levels anyway....

over unity for sure...

glad it arrived ok man. ...

[newperson]

thanks for the reply.  i really did not even pay much attention to the layout.  i focused mostly on your sound sample.  just took a look at the build PDF better.  that is a lot of pots on there.  which did you use to have such clean wiring?  have any pictures of the other pot side?  9 pots and a switch up top and little to no visible wires. 

[deadastronaut]

hi new,

i'm in the process of clearing out my long suffering, spluttering pc and updating to win7 at the moment

so my dropbox is offline, until i sort it out i haven't any more pics to put up..


all the wires for pots are on 3 strand ribbon cable, (which i love using) under the pcb....normal 16mm pots. (i had to remove the plastic pot covers)

same as leds / footswitch wiring too, jus makes a neater job of it. the switch acts as a holder for the pcb too..

rob.

[Luke51411]

I have one Abductor mostly put together with another one yet to build as part of a trade. This is a fabulous circuit, fun for everyone. Thanks again Rob! I'll post pics on this thread when it is completely finished, just a few things left to do.

[scintillation]

Are there still boards available? I'd like one but paypal link on your site doesn't seem to work.

[deadastronaut]

Hi, yes boards are still available,    the site seems ok at my end.....

Rob..

[Luke51411]

A couple questions, on my build the speed pot seems to work backwards eg CW is slower CCW is faster, is the board designed that way to afford a better sweep of the pot? Maybe I just wired it backwards. I'm getting some noise coming through even on bypass which may just be a function of my not so great offboard wiring (and there's a lot of it) it seems to be more prevalent when delay 1 vol is turned up. would that effect the bypass signal though? I'll try changing out PTs just wondering if anyone else has experienced anything similar.

[deadastronaut]

Yep the speed pot is wired backwards...to get better range without having to order re erse logs...

as for noise, i haven,t had that issue at all...bypass should be clean especially.....

[Cozybuilder]

Just label your speed pot "Delay". Then its turning the correct way

Chop done

[Luke51411]

Yep the speed pot is wired backwards...to get better range without having to order re erse logs...

as for noise, i haven,t had that issue at all...bypass should be clean especially.....

Ok I figured as much with the pot. I'll do some probing for the noise, maybe a bad cap or something. I have another one to build so we'll see how that one sounds.

[Luke51411]

I removed the pt2399 and the static noise didn't go away so I poked around a bit with an audio probe. It is not noisy after C5 (input cap) but it becomes staticky at pin 1 of IC5. Pin 1 and 7 are the only pins the probe picks any signal up on that IC. The north end of R4 and south end of R5 also have no signal. Shouldn't there be signal at the north end of R4?
If you want me to take my troubleshooting elsewhere I can start a new thread. I'm hoping this shouldn't be too tough to sort out. I should probably post voltages but I can't find my meter right now, will do that when I find it if necessary.

[deadastronaut]

hi luke, no probs put any issues here ok...it may help others too.

yes there should definitely be signal at north end of R4 it goes to pin 2 ic5 for sure...thats the input...there should also be plenty at pin 1  ic5..

IC5 is for input and output section...which gets tapped/switched to delay after pin 1 IC5.

wrong value maybe?..should be 470k's..for R4/5

[Luke51411]

That's what I thought. They are definitely  470k. I'll take the board out of the box tonight and check for solder bridges/ bad joints. It's odd that there seems to be an issue so early in the circuit yet it works other than the noise...

[Luke51411]

Ok I found my multimeter and voltages look good in IC 5 I again removed all the pt 2399s to confirm that I am not just getting noise from them and I am not. They do effect it but the noise is at a constant level but the "floor" increases with delay time increase and also when turning up the individual delay lines (with the ICs installed). The noise is a constant "static" or "white noise" I'm wondering if I should start replacing electros?
Here are some pics of my board

[Luke51411]

Back at it. Static is still present. I socketed the ic and tried others to no avail. The staic is starting at pin 1 of IC5 it's present when on and bypassed and with pt2399s removed. It's much louder in long delay mode but I think the delay line is just cascading the static. The volume doesn't affect the static level. I socketed the jfet, removed it, tried another, no help. Removed C1 I think (100uf filter cap) and replaced it no change, I might try replacing other electros but I don't think that's it since the static is still present with no pt2399. Where does static come from? I'm kinda lost... I might just finish the second one and hope the problem doesn't persist.

[deadastronaut]

The volume should affect everything.,,its an overall vol...
so theresc definitely an issue somewhere, i just dont get how your getting static from the input onwards..

very srtrange....baffled...hmmmm... :

just notiiced, no leds...stick those on....

speed, and time should only have 2 wires on pots too...

ill, dig mine out and  take a look om....

[Luke51411]

I haven't tried a differen regulator or just removing it, maybe that's injecting noise... That and replacing more caps. I haven't thoroughly checked all the values to make sure they are correct but I don't think most of them would effect where the noise is entering.

[samhay]

This will be a fairly noisey circuit - how much noise do you get, is it louder than a quiet strum?

If you get static with all 4 PT2399s pulled then it is coming from the analogue side - IC5A and 5B - and you can leave the regulator alone (probably). As DA said, the volume should be able to turn this noise off, so if it doesn't, I would suspect you have a grounding problem.

As an aside, you won't get signal at the inverting inputs of an op-amp as these are virtual grounds.

[Luke51411]

It's pretty noisy even in bypass. All the pots are wired offboard. I'll try to tame the excess length on the second build. It's louder than it should be and since it is entering so early in the circuit the pt2399s are just amplifying it. But, it's constant noise the repeats don't effect it. I don't have the extra ground pad connected to anything but I jumper end it with an alligator clip and it doesn't make a difference. Maybe my offboard wiring to the pots is causing it... It just seems like there are very few things it could be since the dry signal path is very short.

[Luke51411]

Also the noise is no longer affected much by the individual delay line volumes, just the overall delay time.