freestompboxes.org

djathey wrote: ↑28 Jun 2021, 17:54 Dry fit for front panel controls…

djathey wrote: ↑03 Mar 2022, 13:59 I haven’t completed this yet, so it’s an unproven effort, so far.

Definitely need to bump this project up, on list of things to-do…

I also probably should have used readily available 78xx/79xx regulators, instead of ldo’s.

I’d also like to add features used within this phaser (even/odd and buffered tap points):

https://www.birthofasynth.com/Scott_Sti ... _schem.jpg

Thanks for the interest.

bumblebee wrote: ↑04 Mar 2022, 02:23 I’d like to get the EH Guitar Synthesizer 8000 (rack unit) up and running but that is a massive project for me. Still, I’m intent on doing it some time.

Scruffie wrote: ↑04 Mar 2022, 13:00

bumblebee wrote: ↑04 Mar 2022, 02:23 I’d like to get the EH Guitar Synthesizer 8000 (rack unit) up and running but that is a massive project for me. Still, I’m intent on doing it some time.

Have you seen this thread? https://www.diystompboxes.com/smfforum/ ... msg1240673

I'm quite familiar with the unit if you need a hand...

bumblebee wrote: ↑04 Mar 2022, 22:18

Scruffie wrote: ↑04 Mar 2022, 13:00

bumblebee wrote: ↑04 Mar 2022, 02:23 I’d like to get the EH Guitar Synthesizer 8000 (rack unit) up and running but that is a massive project for me. Still, I’m intent on doing it some time.

Have you seen this thread? https://www.diystompboxes.com/smfforum/ ... msg1240673

I'm quite familiar with the unit if you need a hand...

Yes, Scruffie….that’s what prompted me to want to do it.

Thanks for the redrawn schematics, too!

I will likely need a hand, lol. I’ll keep your offer in mind. Thanks!

What would be great is any gutshots of the 8000…if you have them. It seems it would be a modular type PCB system, yeah? That was my plan anyways.

There’s certainly no rush as it will be quite some time before I tackle such a large project as I have plenty of others on the list that take priority over it simply because of the complexity of the 8000 (to me).

Scruffie wrote: ↑04 Mar 2022, 22:50

bumblebee wrote: ↑04 Mar 2022, 22:18

Scruffie wrote: ↑04 Mar 2022, 13:00

bumblebee wrote: ↑04 Mar 2022, 02:23 I’d like to get the EH Guitar Synthesizer 8000 (rack unit) up and running but that is a massive project for me. Still, I’m intent on doing it some time.

Have you seen this thread? https://www.diystompboxes.com/smfforum/ ... msg1240673

I'm quite familiar with the unit if you need a hand...

Yes, Scruffie….that’s what prompted me to want to do it.

Thanks for the redrawn schematics, too!

I will likely need a hand, lol. I’ll keep your offer in mind. Thanks!

What would be great is any gutshots of the 8000…if you have them. It seems it would be a modular type PCB system, yeah? That was my plan anyways.

There’s certainly no rush as it will be quite some time before I tackle such a large project as I have plenty of others on the list that take priority over it simply because of the complexity of the 8000 (to me).

Excellent, my plan to ensnare someone else in to helping working on it was successful

Yup, got plenty of gutshots and access to two units through one I repaired and one I've been helping someone else repair.

There are indeed multiple PCB's, a master board with all the pots, switches and mixing and then 3 individual boards connected to that (the schematics are separated in to the individual boards) and a separate power supply board.

I'll try and remember to start a separate thread here with some shots tomorrow, if not, give me a poke.

djathey wrote: ↑03 Mar 2022, 13:59 I haven’t completed this yet, so it’s an unproven effort, so far.

Definitely need to bump this project up, on list of things to-do…

I also probably should have used readily available 78xx/79xx regulators, instead of ldo’s.

I’d also like to add features used within this phaser (even/odd and buffered tap points):

https://www.birthofasynth.com/Scott_Sti ... _schem.jpg

Thanks for the interest.

mictester wrote: ↑22 May 2023, 00:38 There is a fundamental design flaw with this circuit - the LM13600 / 13700 is both noisy and distorted. Put a few of them after one another, and the problems will be multiplied!