mid-fi clai(not) schematic!

[rousejeremy]

You guys were right, of course. I had the 78L05 reversed and fried the PT2399. Everything is back in order.
I'd like to hear more samples of the cubed version too.

[jacobyjd]

Noooo lol, how big did you get it down to? Give me something to aim to.

haha--it wasn't much bigger than the perfboard layout that's been floating around...

[kristoffereide]

Question: Will a JRC386 do the job?

[frequencycentral]

Question: Will a JRC386 do the job?

I used an LM386N1, the lowest of the low. I would expect JRC to work just fine - there're supposed to be better than the LM's aren't they?

[kristoffereide]

I guess, but mine sound like a lasergun so I guess something is wrong. No delay, no fuss, just that lasergun piooooooooo piooooooooooo pioooooo

[kristoffereide]

giant DO'H! I haven't grounded the second board... Update will follow shortly.. jeeees

[kristoffereide]

ok so I did it, and now the guitar come through even when volume at zero. Extreme oscillation and not a cool effect at all ( I realise that's my fault!).

Questions: Is this a "no battery, supply only" FX
Shoult I be able to see the LED light up? (it doesn't)
Is lug 1 and 2 on P4 both connected to top of LDR?

[frequencycentral]

Questions: Is this a "no battery, supply only" FX

I think battery should be fine.

Shoult I be able to see the LED light up? (it doesn't)

Yes - what LED are you using? Do you have the correct polarity?

Is lug 1 and 2 on P4 both connected to top of LDR?

On my layout the top of the LDR connects to lug 2 only - that part of the layout is kind of tough to work out, but if you cross-reference to the schematic you'll get the picture.

[kristoffereide]

Yes... now the LED is the correct way. That what I get for not thinking Now I can see a flash when I insert the DC jack, but its not flashING... Any thoughts about this?

[frequencycentral]

What's working, what isn't? Delay time, mix and volume working? If the LED isnt reacting to the input signal there's an issue between the input and the led, ie around the 386. Is the effect passing signal, and do you have adjustable single repeats?

[kristoffereide]

Hard to hear. The volume is working, I know because the horrible sounds go away when turned down The others interact in making various versions of noise and pitch to the oscillation. The voltage over Q1 is correct.

Is the LED supposed to flash or stay constant? Am I supposed to change rate of flashing or the brightness of the light?


I'll go over the entire board one more time just to check, but I appreciate your help. Nice to know what to look for

[frequencycentral]

Is the LED supposed to flash or stay constant? Am I supposed to change rate of flashing or the brightness of the light?

The LED should flash on when you hit a chord, and fade off as the chord fades. Try setting Track and Depth to minimum - that way you should just get a single repeat, controllable by the Delay pot. The turn track and Depth up just a bit at a time and see what happens.

[kristoffereide]

Nothing different I'm affraid. I'll continue tomorrow, it's night over here now.

[kristoffereide]

I can't find anything wrong still! All the voltages comply, all the parts are the right way...
I'll build another one to see if I can get that one to work. Let me ask, how important are the cap-values on the 2399? Don't know how many 100' I have left. Can I use 150's ?

[frequencycentral]

I shouldn't think the values of the electrolytics are critical. But the smaller value caps around the PT2399 provide some filtering (which I don't think is really optimal in this pedal). I'd just use values close to those specified - you may even improve the filtering that way.

[kristoffereide]

I got it! It was 1 bad 386 and 2 bad 2399 (i should stop using used parts), and some less than fresh OBW but it finally works and I love it! This is an awesome pedal! Is there anything it can't do?!? I built the non-cubed version btw

[frequencycentral]

I got it! It was 1 bad 386 and 2 bad 2399 (i should stop using used parts), and some less than fresh OBW but it finally works and I love it! This is an awesome pedal! Is there anything it can't do?!? I built the non-cubed version btw

[kristoffereide]

frequencycentral - permission to post layout on Norwegian forum? Some DIY'ers love what I'm talking about

[Belt]

the PGS vid for this pedal makes me want to build it

thanks for the schem!

[frequencycentral]

frequencycentral - permission to post layout on Norwegian forum? Some DIY'ers love what I'm talking about

Of course, no problem at all - maybe also mention that the LDR only connects to lug 2 of the depth pot, which isn't clear on the layout. All props to Doug Deeper really for an inspiring design.