JH Frequency Shifter PCB Update

Via JH on AH:

"I've soldered all components to the prototype board of the main FS-1A PCB, and made a quick demo in connection with an old Dome Filter board (that I had originally made for the FS-2). It's all hooked up with alligator clips, and connected to the insert path of my mixing console because I needed a microphone preamp. I think it's a quite stupid demo, but it shows that the new board works, and I think the sound is very clean for a frequency shifter!

New demo (boring, but showing off some of the sound quality):
http://electro-music.com/forum/download.php?id=8848
Older demos (more dramatic);
http://www.jhaible.de/mp3/jh_ber_1.mp3
http://www.jhaible.de/mp3/jh_ber_2.mp3

Unfortunately, I'll have to make a redesign of the main PCB. I noticed that some of the LM13600s I have in the drawer don't work properly, because their gm matching is too bad for that application. In my prototype, I've used a NE5517, and it works perfectly; but that doesn't mean every NE5517 would. So, I'm adding a gm balancing potentiometer to the new design, which will fix the problem, but which means extra investment in another prototype.

I also have ideas for the second board. I'll probably include an extra string of all pass filters, for a deeper Barberpole Phaser effect. And maybe an aread with veroboard-like structure, for everyone to experiment with additions of his/her own. More about the 2nd board later.

I think even though I expect considerably less demand for this project than for the Tau phaser (it's a more difficult project, after all!), the price per board could be similar, so expect something around 55 ... 60 Euro for the set of 2 boards.

JH."