Hi! :)
I've started to build my xox (from Zwillyx shop).
Following the manual at page 37 i'm supposed to test DC bias and have 8.5VDC, but when i put the multimeter probes i read a 0v value.
All other voltages are fine according the manual.
What you suggest to check?
Thanks!
DC bias problem
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- antto
- Posts: 1636
- Joined: Thu Apr 15, 2010 3:21 pm
Re: DC bias problem
you've probably received some printed build manual, but in the past most folks have used the online build manual, which is not paged like a book
so can you clarify exactly at what point of the build process you are that instructs you to measure that voltage?
so can you clarify exactly at what point of the build process you are that instructs you to measure that voltage?
- xtals
- Posts: 10
- Joined: Tue Aug 08, 2017 1:46 pm
Re: DC bias problem
Hi!
I'm using this manual:
http://www.ladyada.net/make/x0xb0x/fab/vco.html
I think that's the same from the Willzyx site after all!
I'm using this manual:
http://www.ladyada.net/make/x0xb0x/fab/vco.html
I think that's the same from the Willzyx site after all!
- antto
- Posts: 1636
- Joined: Thu Apr 15, 2010 3:21 pm
Re: DC bias problem
most probably it's the same manual, printed on paper
but my question was: what is on page 37?
but my question was: what is on page 37?
- xtals
- Posts: 10
- Joined: Tue Aug 08, 2017 1:46 pm
Re: DC bias problem
This:
And that's the description:
"If you don't have a scope, you should at least measure the DC bias, which is about 8.5VDC"
Then, measuring with multimeter at the resistor i have 0V!
thanks
And that's the description:
"If you don't have a scope, you should at least measure the DC bias, which is about 8.5VDC"
Then, measuring with multimeter at the resistor i have 0V!
thanks
- xtals
- Posts: 10
- Joined: Tue Aug 08, 2017 1:46 pm
Re: DC bias problem
Update:
I have solved the problem: Q26 (2SC1583) had some really bad soldering on it...on the smd part a lot of solder paste was left unsoldered and then some pins was shorted.
Cleaned it with ultrasonic bath first and then resoldered, DC bias is perfect now!
Thanks again!
I have solved the problem: Q26 (2SC1583) had some really bad soldering on it...on the smd part a lot of solder paste was left unsoldered and then some pins was shorted.
Cleaned it with ultrasonic bath first and then resoldered, DC bias is perfect now!
Thanks again!
Please be positive and constructive with your questions and comments.