Work in progress

Some images from the workbench.

Mounting hardware in a Lady Dirt tube pedal.

Zeta Sound Lady Dirt high voltage tube pedal
Lady Dirt high voltage tube pedal

The circuit board of the Bull pedal. There’s silicone diodes clipping and in the front of the image you ses two germanium AA144 diodes. There’s three BC184 transistors and one 2N3904. Posted earlier here.

Bull pedal
BULL circuit board

Just had to take this picture. A cap from the 1950:s vs a modern one, same uF and voltage rating.

vintage vs new capacitor
Cap vs cap

Here’s a gut shot from the new prototype of the Maestro PS-1A clone.

MaestroPS-1A Clone zeta-sound
Maestro PS-1A clone.

/Krister

Maestro PS-1A V2

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.

Stepping through the three speeds.
MaestroPS-1A V2 Clone zeta-sound
Maestro PS-1A V2 clone
MaestroPS-1A V2 Clone zeta-sound
Maestro PS-1A V2
MaestroPS-1A V2 Clone zeta-sound
Maestro PS-1A V2
MaestroPS-1A Clone zeta-sound
Maestro PS-1A V2 guts
MaestroPS-1A V2 Clone zeta-sound
Maestro PS-1A V2 circuit board

/Krister

V2 of zeta-sounds Maestro PS-1A clone

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.

MaestroPS-1A Clone zeta-sound
Main circuit board

Here’s the circuit installed in the chassie.

MaestroPS-1A Clone zeta-sound
Maestro PS-1A V2 clone

/Krister

Maestro PS-1A update 6

Here’s what it looks like with some graphics.

MaestroPS-1A Clone zeta-sound
Maestro PS-1A clone
MaestroPS-1A Clone zeta-sound
Maestro PS-1A clone

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.

MaestroPS-1A Clone zeta-sound
Maestro PS-1A clone

So lets try to list what differs from the original.

  • I’ve used 2N5952 fets instead of the 2N4303.
  • It’s got a new input buffer suited for guitar.
  • It powerded by 9VDC.
  • Adjustable high speed.
  • The speed selector circuit, tap the switch and change the speed.

/Krister

Maestro PS-1A project update 4

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

MaestroPS-1A clone

/Krister

Maestro PS-1A project update 2

Had the circuit board fabricated for the PSU and the presets controller populated.

Maestro PS-1A-controller
PSU and the presets controller

Testing the presets controller.

/Krister

Maestro PS-1A project update

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.

Maestro PS-1A

/Krister