Second unsuccesful project - help with schematics

[1951]

Hello everyone,

I'm a beginner when it comes to building stompboxes and electronics. I've been reading a lot about wiring, schematics on pages like geofex, beavisaudio, electro music,..., yet I still can't finish a project succesfully. The first one was an Atari punk console (which I plan of building again) and now there's the simple Noise 567 aka sicbox.

The schematic I used was this one.  And I changed a LDR with a potentiometer, which could also be a problem.
.

Now my questions.

• I connected the + side of the battery to Vcc+, and the negative to the - of the signal input jack, - of the output jack and to the ground. Was that ok?
• Another thing I did was change the LDR with a 100k potentiometer, wiring terminal 1 to ground, terminal 3 to number 5 on the schematics, and 2 to number 6 on schematics. Could someone please explain what I did here wrong?
• The 10uF capacitor should have the longer + wire connected  to the signal input, right?

Thanks for your help!

[deadastronaut]

Hello everyone,

I'm a beginner when it comes to building stompboxes and electronics. I've been reading a lot about wiring, schematics on pages like geofex, beavisaudio, electro music,..., yet I still can't finish a project succesfully. The first one was an Atari punk console (which I plan of building again) and now there's the simple Noise 567 aka sicbox.

The schematic I used was this one.  And I changed a LDR with a potentiometer, which could also be a problem.
.

Now my questions.

• I connected the + side of the battery to Vcc+, and the negative to the - of the signal input jack, - of the output jack and to the ground. Was that ok?
• Another thing I did was change the LDR with a 100k potentiometer, wiring terminal 1 to ground, terminal 3 to number 5 on the schematics, and 2 to number 6 on schematics. Could someone please explain what I did here wrong?
• The 10uF capacitor should have the longer + wire connected  to the signal input, right?

Thanks for your help!

the short legs of the capacitors go in/out...(the side with the stripe)..

tie all grounds together...in-/out-/battery -

try pin 5 to pot 3, pot 2 to pin6 (try leaving pot 1 off for now) ..then join pot 2 to 22nf to 7 and ground.

depending on what value ldr was meant to be there will determine what pot to use...try a 1M....have fun!..

[Govmnt_Lacky]

Now my questions.

• I connected the + side of the battery to Vcc+, and the negative to the - of the signal input jack, - of the output jack and to the ground. Was that ok?

Sounds OK to me. Just make sure that you connect ALL of the "grounds" together. Including the one from the circuit!

• Another thing I did was change the LDR with a 100k potentiometer, wiring terminal 1 to ground, terminal 3 to number 5 on the schematics, and 2 to number 6 on schematics. Could someone please explain what I did here wrong?

This may be a problem. I believe that in this situation, you want to connect the 100K potentiometer as a variable resistor. You can do that by connecting Pin 5 of the NE567 to BOTH pins 1 & 2 of the pot. Then, you would connect Pin 6 of the NE567 to pin 3 of the pot.

• The 10uF capacitor should have the longer + wire connected  to the signal input, right?

The LONG leg of the electrolytic capacitor indicates the "+" side. Also, the cap should have markings on it to indicate which is the (-) side. Usually in the form of a silver/grey stripe on the casing.

[/list]

[ashcat_lt]

It does look like those caps are either backwards or should be non-polarized.  I don't think (?) that would be a deal breaker, though.  It should work fine up until the caps decide they've had enough of the reverse bias and fall apart.

[brett]

Hi

(try leaving pot 1 off for now)

When using a pot as a variable resistor, connect the unused tab to the wiper. Otherwise, it's an antenna that might pick up radio  interference or cause feedback (I wonder if the gurus would comment: does this REALLY happen?). And for neatness.
cheers

[Jdansti]

Hi

(try leaving pot 1 off for now)

When using a pot as a variable resistor, connect the unused tab to the wiper. Otherwise, it's an antenna that might pick up radio  interference or cause feedback (I wonder if the gurus would comment: does this REALLY happen?). And for neatness.
cheers

I think that this is fine when dealing with the audio signal, but I did this once with the speed control pots on a 555 timer and they didn't work correctly until I removed the jumper between the unused terminal and the center terminal.

[deadastronaut]

hence the word ''try''   

[1951]

Thanks for your help. I'll try building it tomorrow, will tell you how it went. 

[1951]

Ok I tried it again today. First I wired the pot like Govmnt_Lacky  said. When that didn't work, i switched the capacitors (like ashcat suggested) and connected the pot like deadastronaut suggested. Sadly, no sound.
I might have used a burned the 567 chip, since I used the old one from the 'unsuccesful project'. But it I don't know. I think it's better I try my luck with the atari punk console again (or if you have an easier suggestion?) and stop trying with the Noise567.

[1951]

I spoke too soon, I can hear something...! After I switched the chip with another one I found, I can hear a quiet sound from the output. It's fading out slowly.

[Jdansti]

Looks like it is time for photos and voltages.