frequencycentral DynaComp PCB Layout

[frequencycentral]

Verified! Enjoy!

[Kearns892]

Thanks a lot, but why the 2 pairs of lines below the transfer

[frequencycentral]

I've started adding those lines to assist in resizing the PnP for printing to the correct size.

[Kearns892]

Ah thanks, what should they measure?

[Earthscum]

0.1 inch. Left line to left line should be 1 inch.

[frequencycentral]

Ah thanks, what should they measure?

The lines are 1, 2, 10, 11.

0.1" / 2.54mm between 1 / 2 and 10 / 11.

If you make 0.1" / 2.54mm a grid in Publisher they should all line up spot-on when you resize.

[Pakaloabob]

Where's D1? I see three diodes on the part list, but I don't see the 3rd diode in the layout.

[frequencycentral]

D1 should be a polarity protection diode, 1n4001 or similar, between +ve and ground. I built this layout into a dual pedal and the other circuit had the protection diode onboard. My bad for not including it on the layout though. You can hook one up on the DC socket or on the copper side of the board.

[Poste]

These are probably silly questions but could you please verify:
1) VR1 is this a trimpot?
2) Do you use a socket for the IC
3) have you changed the wires going the box components slightly?

Thanks
Phil

[askwho69]

is dynacomp quite compressor? or same as CS3?

Thanks for the wonderful layout

A2

[Pakaloabob]

I noticed there is a mistake in this layout.
R10 between +9v and the wiper of the 2k trimpot should be 470k, not 220k.
This is the same mistake on MarkM's layout. It looks like he used the same basic outline for the Dynacomp, Rosscomp, and Safross  Squeeze and apated the component values for each. Since the Ross uses 2 x 220k resistors (with a filtering cap to ground in between the two) instead of one 470k.
I think this was just an oversight when adapting the the Dynacomp layout from the Ross. 

[MoltenVoltage]

Just digging into my DynaComp (a newer one) and the transistors are MPS A18

The chip is CA3080E, not A as in some schematics

It looks like tantalum caps throughout except the power supply

Power supply cap is 100 uF 16V

Diodes are 1N4148

Thanks for the layout!

[Nocaster Cat]

Sustain/Sensitivity pot should be a C500K. Linear will work fine but the original was a reverse audio and offers more control.