Author Topic: Harbinger 1.5 - not working  (Read 1134 times)

nicotina74

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Harbinger 1.5 - not working
« on: August 13, 2021, 03:13:46 PM »
hi guys, i need some help.  i finished assembling the circuit but it doesn't work properly.  i am not expert but i could verify that the voltages on transistor mspa13 - Q12 has variable voltage values ​​when it should have stable voltages.  do you have any idea where the problem might be?  thanks for any help you can give me.
Tanks
Nicola
« Last Edit: August 14, 2021, 10:26:50 AM by nicotina74 »

jimilee

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Hambiger 1.5 - not working
« Reply #1 on: August 13, 2021, 03:25:26 PM »
Hey hey, welcome! We’re absolutely happy to help, we just need some information please.

To get tech help, in the first post of your thread, you must include:

(1) Project Name
(2) General description of the problem
(3) Steps that you have taken to try to resolve the issue
(4) List any substitutions you used for parts/values


Clear close up in focus pictures of both sides of the board.

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Pedal building is like the opposite of sex.  All the fun stuff happens before you get in the box.

Zerro

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Re: Hambiger 1.5 - not working
« Reply #2 on: August 13, 2021, 04:35:54 PM »
Some schematics would help too, if available :@)
"Nudíte se? Kupte si našeho cvičeného ježka! Pobaví vás svými veselýmí kousky!"

nicotina74

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Re: Hambiger 1.5 - not working
« Reply #3 on: August 13, 2021, 11:18:10 PM »
Hi, sorry I thought that the name of the project shown on the title of the discussion was sufficient.
1) Project name: Harbinger 1.5 (Univibe (TM) for 1590BB) - the version with 9v power supply.
2) The pedal turns on, the speed and depth controls work because the lamp responds to the two controls, but connecting the pedal to the guitar and the amplifier the pedal does not work. I try to explain myself better: in vibrato mode the sound comes out but without effect, in chorus mode the sound is distorted and is perceived as soon as the effect is very low in volume. Switching from modern / vintage mode seems to have an effect as I perceive the sound to lighten or darken.
3) What was I able to check?
a) I double checked the values ​​of all resistors (with color codes)
b) I checked the capacitor values ​​and polarity in the case of electrolytic capacitors.
c) I checked the diodes
d) I checked that the transistors were of the type indicated on the project and that the pinouts were correct.
e) Finally I checked the voltages of the transistors, of the IC1 LT1054 and of the LM7815 voltage regulator with the tester, with powered pedal, and compared with the voltage table of the project.
The voltage readings I have found that are suspect are as follows:

from project: Q12 (MPSA13) C = 9.2 B = 9.08 E = 8.13
detected: Q12 (MPSA13) C = varies B = varies E = varies

from project: Q14 (2n5457) D = 17.5 S = 2.77 G = 0
detected: Q14 (2n5457) D = 17.14 S = 1.47 G = 0

from project: IC1 LT1054
1 = ~ 2.1v
2 = 4.94
3 = 0
4 = 0
5 = 0
6 = 2.56
7 = 1.38
8 = 9.26

found:
1 = 1.37
2 = 5.01
3 = 0
4 = 0
5 = 0
6 = 2.57
7 = 1.42
8 = 9.11

I did not use equivalent components but those indicated in the project.

The rest seems okay to me.

Thanks, any advice or suggestion is precious !!

« Last Edit: August 14, 2021, 08:24:06 AM by nicotina74 »

Bio77

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Re: Hambiger 1.5 - not working
« Reply #4 on: August 14, 2021, 12:58:51 AM »
Can you add pictures of the top and bottom of the PCB? 

nicotina74

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Re: Hambiger 1.5 - not working
« Reply #5 on: August 14, 2021, 02:57:56 AM »
Here are the pictures!

Zerro

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Re: Hambiger 1.5 - not working
« Reply #6 on: August 14, 2021, 09:21:22 AM »
Reflow that copper side from tin dust and controll it from udesirable bridges between points. I see at picture minimally 2 sufficient places. Thats for a start.

BTW, hambiger and harbinger are two different words. For those skilled in electronics but not in possible names of projects it will be confusing and junk work to look for schema at web.
"Nudíte se? Kupte si našeho cvičeného ježka! Pobaví vás svými veselýmí kousky!"

jimilee

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Re: Hambiger 1.5 - not working
« Reply #7 on: August 14, 2021, 10:22:55 AM »
Here are the pictures!
Thank you, that’s helpful. Checking your components is a great starting point. It looks like several solder joints are starved. Solder should flow through the board eyelets and look like little silver Hershey kisses. If you would, please go back over the board and reflow, adding solder where needed. Also, yes, watch out for solder bridges.


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Pedal building is like the opposite of sex.  All the fun stuff happens before you get in the box.

nicotina74

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Re: Hambiger 1.5 - not working
« Reply #8 on: August 14, 2021, 10:29:30 AM »
BTW, hambiger and harbinger are two different words. For those skilled in electronics but not in possible names of projects it will be confusing and junk work to look for schema at web.
sorry I corrected!

nicotina74

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Re: Hambiger 1.5 - not working
« Reply #9 on: August 14, 2021, 10:32:35 AM »
Reflow that copper side from tin dust and controll it from udesirable bridges between points. I see at picture minimally 2 sufficient places. Thats for a start.

could you mark the colon on the image?  I would be very grateful. Tanks

Zerro

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Re: Harbinger 1.5 - not working
« Reply #10 on: August 14, 2021, 12:53:55 PM »
I assigned the most suspicious. But with some needle try to clear all, and from rosin rests too.
"Nudíte se? Kupte si našeho cvičeného ježka! Pobaví vás svými veselýmí kousky!"