squirrelboy
Member
Yeah, it’s weird. The pedal works fine for approximately 30 seconds each time I unplug and plug the power back in, and then after 30 seconds it seems like the LFO stops oscillating.
Any ideas?
Any ideas?
Byzantium Flanger works for approximately 30 seconds each time I plug the power in.
- Thread starter squirrelboy
- Start date
blackhatboojum
Well-known member
Can you post some clear pictures of the top and bottom sides of your pcbs so we know what we’re looking at?
squirrelboy
Member
Ok there are the pictures of the board ^.
You can see that the female headers have extra sockets, but I used tweezers to remove the connector bits (essentially turning a 4 pin or 3 pin header into a 2 pin header). Also, I have two capacitors running in parallel to get the value I needed.
You can see that the female headers have extra sockets, but I used tweezers to remove the connector bits (essentially turning a 4 pin or 3 pin header into a 2 pin header). Also, I have two capacitors running in parallel to get the value I needed.
squirrelboy
Member
Could this be caused by having the wrong value for a resistor?
squirrelboy
Member
I just checked the voltage at each pin on the 4558s. I got the following on both:
1. -4.37
2. -4.37
3. -4.37
4. 0
5. -8.86
6. -4.37
7. -4.37
8. -4.37
Do those values seem correct?
Locrian99
Well-known member
Yes those look right. Typically you’d want your com probe on ground looks like you got it reversed.
Locrian99
Well-known member
Ooohh. You didn’t socket your bbds. This makes the pedal gods angry. In all seriousness though always socket ic’s especially the pricier bbd’s.
First thing I would probably do is just go through and reflow all your solder joints. They don’t look “bad” but it’s one of the easiest first steps for trouble shooting.
First thing I would probably do is just go through and reflow all your solder joints. They don’t look “bad” but it’s one of the easiest first steps for trouble shooting.
JTEX
Well-known member
No they don't. Pin 8 is Vcc and you should have around 9V on it. Or since you measured it with your probes backward, you should get about - 9v. Also, pin5 should have about 4.5V.
squirrelboy
Member
Ok I’m going to check again to see if I have a wrong resistor value.
squirrelboy
Member
Also, is there a schematic available anywhere for this pedal?
squirrelboy
Member
Ok I just rechecked my voltages and now on Pin 5 I am indeed getting about 4.5V, and I am also getting 9V on pin 8.
Also, I am getting 5.6V on pin 8 of the TL022 and 5.6V on the output of the 78L05.
Also, I am getting 5.6V on pin 8 of the TL022 and 5.6V on the output of the 78L05.
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blackhatboojum
Well-known member
Are your manual and res pots insulated so that they’re not touching any solder connections?
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Mcknib
Well-known member
I don't know how up to date the info I have is but what value should R50 be in the parts list I've got it's 150K on your pcb it's 470K that looks to be part of the LFO circuit
I didn't check beyond finding that so if you haven't already check all component values and orientation are correct
You could use the BF2 schematic here to give you an idea of the circuit layout obviously the component reference designators won't be the same and I'd imagine it won't have the FET bypass switching
Check your voltage regulator isn't getting hot I know the L78L05 has internal thermal shut down if it gets too hot and therefore shuts down and cuts out
I didn't check beyond finding that so if you haven't already check all component values and orientation are correct
You could use the BF2 schematic here to give you an idea of the circuit layout obviously the component reference designators won't be the same and I'd imagine it won't have the FET bypass switching
Boss BF-2 flanger guitar pedal schematic diagram
The schematic diagram of Boss BF-2 flanger guitar pedal
www.hobby-hour.com
Check your voltage regulator isn't getting hot I know the L78L05 has internal thermal shut down if it gets too hot and therefore shuts down and cuts out
Locrian99
Well-known member
Yea sorry in my head I just fixed that he made pin 5 pin 8
squirrelboy
Member
Yes I am using a 2N5807 instead of a BC560C. The 5807 has a reverse pin orientation.
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