PYE Compressor/Limiter Thread *boards shipping* BOM up!

hey abe

glad to see this thread is still alive.

i finally got my pcb all hooked up and i subbed in the 120r resistor in place of the
oscillator inductor but unfortuneatley its not working. :-\ all im getting a very low oscillating sound coming through?
ive double checked everything and im pretty confident its not a mistake on my side, am i still missing something??
i see ur talking about using a 555 chip should i be looking at this instead???

cheers
mick

leadbreath said:

hey abe

glad to see this thread is still alive.

i finally got my pcb all hooked up and i subbed in the 120r resistor in place of the
oscillator inductor but unfortuneatley its not working. :-\ all im getting a very low oscillating sound coming through?
ive double checked everything and im pretty confident its not a mistake on my side, am i still missing something??
i see ur talking about using a 555 chip should i be looking at this instead???

cheers
mick

Click to expand...

Hey Mick,

is your oscillator running?

Wait, just reread your post, sorry I think there was some confusion, you can sub the 120R resistors for the L1 and L2 inductors of the filter circuit, not the oscillator torriod. But you can sub a 555 chip set to ping at 250Khz and feed that into D1

hey abe

right, with u now. do u have any of the oscillator torroids available? im not exactly sure how to work on the 555 chip??

mick

Hi Mick,
What I did is on the "playground" part of the PCB solder in a dip 8 socket and then you wire up the power for the NE555 chip. (remembering that the "+" rail is actually ground, so you hook the "gnd" of the 555 chip to the negative rail and the VCC to "gnd" etc etc) Hope i didn't make things more confusing, but important to remember since the Pye runs off a negative rail.

Anyway, then I am using a 100p capacitor as the timing cap, and then used a 20k resistor from the power to discharge pin and a 2k trimmer (to fine tune the frequency) to the Trig pin. Using the totally standard setup you always see the ne555 circuit setup as (2 resistors and a cap) Then you feed that directly into D1.

You might want to use the TLC555 as some cheaper NE555's don't even get up to a faster oscillation than about 150khz and you want to set yours to 250khz.

Also be sure to use a 1nf cap across the power rails close to the chip. Helps stabilize it. Good luck!

Hi Abe (and everybody else), glad to see this is still alive, sounds like a most interesting project! Also glad it seems NE555 will substitute easily a custom wound oscillator I had no idea how to put this together.

My question would be, if I go the NE555 route, can I eliminate R47, TR14, R49 and C25? Otherwise it is not clear to me where the emitter of TR14 would be connected to. Maybe u can sketch us a small circuit example for the use of this IC?

Best Regards,
M.

This thing sounds awesome!  I think I need a couple channels.

Cheers,
Zach

yeah, so do I!

Any word on the new run of boards Abe?

Anything new on this?

go abe go!
I know this is a project worth waiting for!
G

Hello
Yes I have the rev 2 boards (had them for a while now) just checking and making sure the NE555 chip replacement for the oscillator sounds like the original toroidal oscillator and various other things. I admit I need to get cracking on it. Thanks for the reminder guys!! Should have boards and kits available soon.

Cool!

Not that I need to start another project.... but...... I've always wanted one of these :

Awesome Abe!!!
yes yes yes!

DIY is gonna kill me......

I'm in

... it's killing me too...  ;D
sooooo much DIY to do...

Great project!! Respect Abe!
I'm in for one!

ROCK-ON!

Sounds good Abe. Sure hope the replacement components work out ok!

Bump. Bump. Bump. Bumpity bump...  ;D

abechap024 said:

Hello
Yes I have the rev 2 boards (had them for a while now) just checking and making sure the NE555 chip replacement for the oscillator sounds like the original toroidal oscillator and various other things. I admit I need to get cracking on it. Thanks for the reminder guys!! Should have boards and kits available soon.

Click to expand...

very cool, love it, i'am in for two

Wait so much!
Fantastic project

I would love to build a dual mono/stereo of this!  The Pye is one of my fav comps on drums