Building f-5 cviller layout questions?

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semi932

semi932

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Joined 2009
#1
I've populated two boards from the diy store with a kit bought elsewhere.

I know the parts are installed correctly except for maybe the pots for setting bias.

Is there a certain polarity for these?

Also I didn't install any thing in the led area as it's not necessary in my app.
Should this make any difference? Doesn't look like it to me.

I'm getting a dead short when plugging in one board with the dim bulb tester.
I know the power supply is ok as I tested it with a good 3886 board and everything is as it should be.

Can't find any mistakes on board and I have gone over it many times and all is correct.

Frustrating as I'm ready to hear some good sounds.😕😕

Any insight?
 
#2
Regarding the trimmers you need to measure the resistance across R3 & R4; assuming they are the same as my cviller pcb's. Clockwise or anti depends on how you've installed them. Lots of info on all the other F5 threads.
 
#3
[special=]%[/special]
semi932 said:
I've populated two boards from the diy store with a kit bought elsewhere.

I know the parts are installed correctly except for maybe the pots for setting bias.

Is there a certain polarity for these?

Also I didn't install any thing in the led area as it's not necessary in my app.
Should this make any difference? Doesn't look like it to me.
Code:

I'm getting a dead short when plugging in one board with the dim bulb tester.
I know the power supply is ok as I tested it with a good 3886 board and everything is as it should be.

Can't find any mistakes on board and I have gone over it many times and all is correct.

Frustrating as I'm ready to hear some good sounds.😕😕

Any insight?
Click to expand...

It is quite easy to get the pots right. Measure the pots across it's legs and the ohmmeter should read 0 (across one free leg and the other two which are shorted by the pcb), irrespective of how you have mounted them. Bulb will light up, if the pots are set higher...
 
#4
semi932 said:
I've populated two boards from the diy store with a kit bought elsewhere.

I know the parts are installed correctly except for maybe the pots for setting bias.

Is there a certain polarity for these?

Also I didn't install any thing in the led area as it's not necessary in my app.
Should this make any difference? Doesn't look like it to me.

I'm getting a dead short when plugging in one board with the dim bulb tester.
I know the power supply is ok as I tested it with a good 3886 board and everything is as it should be.

Can't find any mistakes on board and I have gone over it many times and all is correct.

Frustrating as I'm ready to hear some good sounds.😕😕

Any insight?
Click to expand...

The LED's aren't needed. It will help if you post a picture.
 
#5
anilva said:
[special=]%[/special]

It is quite easy to get the pots right. Measure the pots across it's legs and the ohmmeter should read 0 (across one free leg and the other two which are shorted by the pcb), irrespective of how you have mounted them. Bulb will light up, if the pots are set higher...
Click to expand...


So if the bias is too high it will keep the bulb bright?

I'll recheck all and check this point.
 
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