Amps and effects
Video and pictures of the V2 zeta-sound clone of the Maestro PS-1A phase shifter.
Mainly changes made in the main circuit board layout , allowing the stompswitches a bit more centered and using onboard in/output jacks. The speed selector circuit works the same as in V1, tap the switch and change the speed through three presets. Blue -> Slow, Green -> Medium, Red -> Fast.
/Krister
This is what’s to be the V2 of the PS-1A clone. It’s got a new main circuit board with onboard in/output jacks.
Here’s the circuit installed in the chassie.
/Krister
Uptated the Modulation page with the Maestro PS-1A
/Krister
Here’s what it looks like with some graphics.
I’ve fixed one issue with the speed preset switch, it could sometimes skip one of the three speeds, jumping from slow to fast skipping medium. It now goes steady from slow (1Hz) -> medium (2Hz) -> fast (7Hz).
I’ve made the depth trimmer available from the bottom lid and added a trimmer for the fast speed as my client requested, adjustable 3- 7Hz.
So lets try to list what differs from the original.
/Krister
Soundclips of my PS-1A clone
/Krister
Got the pedal up and running. Doing some tweaking to the circuit calibrating the trimmers. Sounds good! I’ll try to get some soundclips up.
Gutshot
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Had the circuit board fabricated for the PSU and the presets controller populated.
Testing the presets controller.
/Krister
This project got forgotten for many reasons, earlier posts can be found here and here. Had a look at the project files for the schematic and the layout. I had some changes made to the schematic, mostly around the PSU and the speed presets. I’ve decided to go for a single stompswitch to navigate through the three speeds in the LFO.
A picture of the layout Im gonna go with.
/Krister
Here’s a continuation on the Six stage phaser post.
So I finally got the fets matched and ready to go into the circuit. It all seems to work as it should. Here’s a short soundclip recorded as I take it through the presets, slow, medium, fast and then back to medium and slow. Poor quality on the recording though, using a tone generator and cellphone for recording.
You can hear the nice feature of the ramp working.
Now the work continous, it’s time to modify. The input buffer needs some tweaking and the I’ll have to decide how to the speed presets will be set, who knows were it will end.
/Krister