Show Posts

1

VFE Projects / Re: VFE Choral Reef Build - Distorted Output

« on: August 06, 2020, 11:21:23 AM »

Oh I see, I thought you'd resolved the problem.

I think photos might be of use in this case, seems like there might be a short if the VB is working elsewhere.

2

VFE Projects / Re: VFE Choral Reef Build - Distorted Output

« on: August 06, 2020, 09:21:08 AM »

That'll do it, I was expecting that the BBD output op amp was going to be the problem, given how close to the rails it ends up biased.

3

General Questions / Re: 24mm pots and a Mestro Phaser

« on: August 06, 2020, 08:36:13 AM »

Yeah I've been down that road before, you'll probably have to keep an eye on ebay for used lots of old potentiometers.

It's not ideal but the rate pot is more dependent on taper than the 'balls' so you could switch those around and try out a standard log or linear for the feedback which are a little easier to find in 24mm.

You can also try and repair the wafer (I know pinkjimiphoton uses a pencil to do it) but perhaps if it had been fiddled with before, that might have already been attempted and failed.

4

VFE Projects / Re: VFE Choral Reef Build - Distorted Output

« on: August 06, 2020, 04:16:04 AM »

What sort of pickups are you using? It's not exactly designed for high headroom.

Could you please also post your MN3008 voltages regardless, just so I can double check them.

5

Tech Help - Projects Page / Re: Pork Barrel 2019 Help Request

« on: August 01, 2020, 09:43:20 AM »

1 & 5 are fine (power is switched for the MN3207 vs. MN3007) pin 6 should be the same as pin 2, there's a problem with your 3102.

6

Build Reports / Re: Lectric FX DC Echo

« on: August 01, 2020, 04:29:17 AM »

Quote from: diablochris6 on July 31, 2020, 08:39:58 PM

Fantastic turnaround.

A week from release for one of the largest analogue delay builds out there? That's gotta be a record.

I'm so glad you're digging it! And a man after my own heart with enclosure art like that

Quote from: danfrank on July 31, 2020, 07:53:27 PM

It's like a DMM but better. Much better.

Them's mighty big words

7

General Questions / Re: 24mm pots and a Mestro Phaser

« on: July 29, 2020, 12:45:28 PM »

Pots can wear out or suffer from skips etc, yes. You might be able to repair or replace the wafer rather than finding a replacement pot depending on its construction.

http://www.geofex.com/article_folders/potsecrets/potscret.htm

Of course, it could be something else in the LFO circuitry causing strange behaviour, perhaps the electros have gone bad.

8

General Questions / Re: A Simple Clipping Indicator Circuit?

« on: July 28, 2020, 02:38:13 PM »

It's just the transistor bit.

Here it is negative ground, 'input' is R10.

9

General Questions / Re: A Simple Clipping Indicator Circuit?

« on: July 28, 2020, 02:20:07 PM »

Deluxe Memory Man, Overload LED.

10

Tech Help - Projects Page / Re: Collosalus 2015 won't bias??

« on: July 26, 2020, 06:05:33 PM »

Continuity?

11

Tech Help - Projects Page / Re: Collosalus 2015 won't bias??

« on: July 26, 2020, 02:38:27 PM »

Those subs should be fine.

So, you definitely have the scope & signal generator set right, have you tested you have good anti-phase square waves on the BBD clock pins and also that the signal isn't getting lost before the BBD?

If so the problem must be on the output of the BBD, perhaps Q4.

12