Quiet Azimuth

[ipsofacto]

I'm having troubles with my Azimuth build. Signal is passing fine in bypass and the LED turns on, but the pedal is extremely quiet when engaged. Here's my IC readouts vs [baseline] voltage:

1. 3.944 [4.68]
2. 3.865 [4.68]
3. 3.707 [4.48]
4. 0

• 
  5. 3.945 [4.63]
  6. 3.949 [4.67]
  7. 3.949 [4.67]
  8. 7.93 [9.61]
  
  I also checked the resistors, and found that R2 is measuring 2Ω vs 1kΩ, and RPD is showing 0.3Ω vs 2M2Ω. The germanium diode appears to be working fine.

[bluebunny]

Welcome to the forum.

Could you post some pictures of your build and the schematic you're working from please?  Your battery is a little low, but the opamp readings are otherwise OK.  Were you measuring those two resistors you mentioned in-circuit?  (They are, in general, in parallel with the whole of the rest of the circuit.)

[antonis]

Welcoime, also..

Although I presume you didn't measure R2 & RPD isolated from the rest of the circuit, R2 value isn't critical for circuit good working status..
(it just sets minimum IC1A gain for VOICE pot set full up..)

RPD value DOES matter a lot 'cause it's effectively set in parallel with R1 determining equivalent input impedance..!!
300mΩ indicates a short between Tip & Sleeve..!!

[PRR]

7. 3.949 [4.67]
8. 7.93 [9.61]
..........

They used a very fresh 9+V battery and your battery has sagged below 8V. The other voltages are in proportion and probably "right", though low.

Your "2" reading on R2 may just be the GAIN pot turned all the way down. Though 2 ohms is mighty small for the end of a 500K so you should check for solder-blobs.

[ipsofacto]

Although I presume you didn't measure R2 & RPD isolated from the rest of the circuit, R2 value isn't critical for circuit good working status..
(it just sets minimum IC1A gain for VOICE pot set full up..)

RPD value DOES matter a lot 'cause it's effectively set in parallel with R1 determining equivalent input impedance..!!
300mΩ indicates a short between Tip & Sleeve..!!

Thanks for posting the circuit! I have not tried measuring those resistors in isolation, so I'll check that. I'm not sure what you mean regarding the tip and sleeve short. Is it that there's a short in the in/out jacks?

They used a very fresh 9+V battery and your battery has sagged below 8V. The other voltages are in proportion and probably "right", though low.

Your "2" reading on R2 may just be the GAIN pot turned all the way down. Though 2 ohms is mighty small for the end of a 500K so you should check for solder-blobs.

Thanks, I'll check the solder blobs as well. I'm not using a battery however. This is a 500mA 9V wall wart I'm testing with. To my knowledge it's working fine with other pedals, but I'm not really sure how I'd confirm that.

[ipsofacto]

Here's photos of my solder job if that helps diagnose the issue. Here's a link to the build guide as well.

     

     

     

R2 and RPD appear to have the correct measurements when isolated, so that doesn't seem to be the issue. As far as I can see, the solder blobs are fine, though a few are a bit large.

Just tested it with a Volto as well as the wall wart. Still have a huge volume drop unless the tone knob is dimed. Getting hardly any gain/clipping even with the gain knob dimed out.

[anotherjim]

Could one of those ribbon cables on either the jack or footswitch boards be fitted backwards? If the connector housings are preassembled on the cable, that too could be wrong. Also, check for wire "hairs" sticking out from the ends of those cables.

[antonis]

I'm not sure what you mean regarding the tip and sleeve short. Is it that there's a short in the in/out jacks?

I refer on IN jack..
300mΩ measurement across PRD indicate a short between IN jack tip & sleeve..
ALL of incoming signal is leaked to ground..

What Jim said above about wire "hairs" is the most possible cause..!!
(check for IN and/or GND neighbour ribbon cables..)

[duck_arse]

if it were me, I'd remove the caps fitted at C3 and C4 and swap them over .....


and welcome.