Dyna Comp clone issue

[dorukakkus]

Just built a clone with the pcb and schematics from tonepad http://www.tonepad.com/getFile.asp?id=9 not the ross mod just the normal dynacomp. The issue is it distorts sound when playing chords and it barely compresses the sound.The chip reads CA3080EZ V06126Q. Bad joints or short circuits are thoroughly checked no problems there. Vb reads 2.41 with the battery at 8.91. Tried biasing the chip it did nothing.

[PRR]

Where did you get the '3080? The die has been out of production for decades. Recently Rochester got some for SmallBear, either packaging old dice or making new dice I forget. More recently Alfa has the compatible Alfa AS3080E but that's not the number you report.

[Baran Ismen]

Where did you get the '3080? The die has been out of production for decades. Recently Rochester got some for SmallBear, either packaging old dice or making new dice I forget. More recently Alfa has the compatible Alfa AS3080E but that's not the number you report.

We got them in Turkey sold in some stores. Also 3094 is available.

[dorukakkus]

As baran said it is fairly easy to buy the ca3080 in turkey for 1 to 5 dollars

[Slowpoke101]

Please take some voltage measurements of the transistors and the I.C, note them down and then post them back here.
Also taking some close up pictures of both sides of the circuit board and posting them here too will be very helpful.
Normally a CA3080 will distort badly if its input signal is too high and it is very easy to overload this particular I.C.
Your guitar may also be over-driving the compressor - some humbucker pickups can do this and active pickups can also do this too.

[dorukakkus]

SO i went thorugh the route checking voltages and stuff. I use a telecaster with vintage type pups so it cannot overdirve the chip that easily. Just in case i have ordered  another ca3080 couple days ago.I tried sawpping them out and it worked flawlessly. In my case it was a faulty chip.

[duck_arse]

for our records, would you be so kind as to take a photo of both the good and the bad parts, please? little details, and all that.

[Baran Ismen]

SO i went thorugh the route checking voltages and stuff. I use a telecaster with vintage type pups so it cannot overdirve the chip that easily. Just in case i have ordered  another ca3080 couple days ago.I tried sawpping them out and it worked flawlessly. In my case it was a faulty chip.

Tell me where did u get the one that worked also please.

[ElectricDruid]

Alfa Rpar in Latvia have been cloning the CA3080 as the AS3080E for a few years now too. It's a drop-in replacement for any circuit using the original CA3080, but meets or exceeds the specs for the selected "A" variant of the original CA3080. They also added one extra feature (hence the "E" for "Extended" in their naming) which is that they added the linearisation diodes from the LM13700 to allow a better S/N ratio. The CA3080 had several unused pins, one of which they chose for this job, so circuits designed for CA3080 don't connect this pin and the chip behaves exactly like the original CA3080. Nice touch.

I've played with the chip and I'd say it's better than the originals. Less hissy, and more 'off' when off. I liked it a lot. Definitely better than some dodgy relabelled thing from a eBay seller.

The AS3080E is available at all your favourite chip boutiques .

[StephenGiles]

Where did you get the '3080? The die has been out of production for decades. Recently Rochester got some for SmallBear, either packaging old dice or making new dice I forget. More recently Alfa has the compatible Alfa AS3080E but that's not the number you report.

We got them in Turkey sold in some stores. Also 3094 is available.

I wonder if the 3094 is available in Cyprus, I know some people there who could possibly run the border!!!