best capicitor for a flatline?

[fatfoohy]

So, question time.  The capacitor parallel to the LED from the led/ldr combo, what is the best value for it? i was thinking that maybe if you made it a smaller value, it would cause a quicker attack time. However i have no idea, has anybody played with this thought? I'd do it myself, but im putting it in a 1590A and the cap with a socket doesnt fit. Thanks in advance

[CynicalMan]

The attack time is mostly set by the LED/LDR. Reducing the cap reduces attack by a little bit, but not much, and reducing it too much causes a growly distortion on decays when the compression is turned up. I used 47u in mine because that was the lowest I could go without the distortion.

[fatfoohy]

hmmm alright thank you for the insight, im just gonna go with 1 uf and hope for the best

[MartyMart]

I used a very small 16v 100uf cap .... no problems in a 9v circuit.

MM

[fatfoohy]

hmmm.....boxed it up, but there's some distortion, i think i may have a short somewhere, but could the capacitor be causing this? it's just a little distorted

[CynicalMan]

Try increasing the cap from 1uf to 47uf or 100uf. Like I said, I got distortion when the cap was lower than 47uf.

[Slade]

1uF is way too low for that cap. I use 100uF too. I'm gonna try a 47uF, though, CynicalMan

[fatfoohy]

hmmm, well i have a 1uf, 4.7uf, 10uf, 47 uf, and 100uf, so maybe i'll check out the 47 and 100 tomorrow, thanks for all of your help guys!

[askwho69]

IS FLatline Comp quieter than CS-3? is this required for boosting distortion? thnaks

[MartyMart]

fatfoohy - Just checked mine and it has a 16v 47uf in that position, I remember having a bit of
distortion and "weirdness" when going lower than that.

askwho69 - Flatline is very quiet in operation and has a TON of output volume for some great boost also.

MM

[fatfoohy]

hmmm, yeah well i'll definitely try out a 47 and 100, for the record.....i feel retarded for misspelling capacitor in the title of this post

[fatfoohy]

wow......put in the 100uf, fired this thing up, sounds amazing! i added a switch to go between normal, a boss, and then the expansion mod, and it sounds amazing all around! it really makes my slap bass sound orgasmic(am i allowed to say that?) thanks for your help guys!

[fatfoohy]

got it boxed and working! my second build ever, and first in a 1590a, I'll post pics monday, it's late, and tomorrow im out of town

[askwho69]

WOW really! i want this )) can someone share some PCB on this great compressor please really need a compressor as booster CS3 is very noisy its great but low output

[fatfoohy]

sustain is a 100k linear pot, volume is a 100k logarithmic, the switch and be a two or three way, two way(on on) would be compression and expansion, 3 way (center off) would be compression boost and expansion. to omit the switch put a jumper between where the wire connects to the board for the switch's middle lug and the pad that connects to the IC's first pin(between the red and black wire's pads

[askwho69]

Thanks A Lot  bro.. is this layout verified?

[fatfoohy]

it was verified before i added the mods for a switch, and now i have verified it (i omitted D5 for what it's worth)

[Hides-His-Eyes]

Protection diode backwards? Or have I missed something in the reflection?

Looks to be shorting 9v to ground...?

[fatfoohy]

oh no idea, i didnt make this layout....

[askwho69]

i found a thread a while ago and it was said that d5 is backwards.. we can omit it as you did