[sdiy] BIG PSU ISSUES

[Dan Snazelle]

nope

they are 22ohm. just checked.

 NOW i dont know if i should do this BUT IF i move the trimmers all the way up when i have a load, i can get it to around 11.2 volts...but without a load this goes up to almost 15 volts

the only thing that might be a problem is I also am running a 6volt regulator straight off of the PSU (but there is no load attached to that)

i am stumped. could it be a busted cap on the  psu?? (of course when i use it to power my modules, it works just fine)
hmmmm




--------------------------------------------
check out various dan music at:

http://www.myspace.com/lossnyc


http://www.soundclick.com/lossnyc.htm


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(or for techno) http://www.myspace.com/snazelle


________________________________
From: raywilson at comcast.net
To: subjectivity at hotmail.com; synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] BIG PSU ISSUES
Date: Wed, 13 Aug 2008 21:19:36 +0000


Measure the current draw of the project. Ohm's law is Ohm's law. You must be dropping the 3 volts on the resistors. Are you sure they are only 22 ohms?  To get 3 volts drop across the 22 ohm resistor you need about 136 mA. That sounds way high. Now if they were 220 ohms you would only need 13.6 mA which sounds about right for what you're describing. Check the Rs.

-------------- Original message --------------
From: Dan Snazelle 

>
> I have a nice powerone supply. its a 12volt or 15 volt +/- volt. I am running it
> at 12 volts and without a load i used the trimmers to set it for 12volts.
>
> i think this model can handle at least .5 amps per channel. i think actually .75
> (in +15/-15 mode it handles less amperage)
>
> now when i hook up my current project, which is three giant breadboards (of
> mainly CMOS low draw chips) to my STAR breadboard (which is the PSU hooked up to
> a breadboard which everything else plugs into with 22r resistors as fuses), and
> i take a reading of the VOLTS of my project i get a reading of 9 volts.>
> My questions
>
> 1. there are trimmers on the PSU to push it back up to almost 12 volts post
> load..should i do this? or are the trimmers only for PRE LOAD?

> 2. how can i get around this? could my PSU be messed up?
>
> 3. i know these are low amp chips. i only have ONE led on the entire project.
> there are some opamps.
> is load voltage not the same? do i not need to worry? or should i get a measured
> 12 volts? and -12 volts?
>
>
> thanks so much
>
>
>
>
>
>
>
> --------------------------------------------
> check out various dan music at:
>
> http://www.myspace.com/lossnyc
>
>
> http://www.soundclick.com/lossnyc.htm
>
>
> http://www.indie911.com/dan-snazelle
> (or for techno) http://www.myspace.com/snazelle
>
>
>> From: philip.macphail at ntlworld.com
>> To: neil.johnson97 at ntlworld.com; synth-diy at dropmix.xs4all.nl
>> Subject: Re: [sdiy] Another SSM2164 question
>> Date: Wed, 13 Aug 2008 21:49:04
+0100
>> CC:
>>
>>>>
>>>
>>> Thanks, and cheers. Now working on schematic entry and then a PCB.
>>> Thanks to an A3 laser printer from a local Freecycler (who, ironically
>>> is/was on the list as well - hi Phil!) I can now print out my
>>> schematics
>>> BIG!
>>>
>>> Neil
>>> (likes his diagrams in A3)
>>>
>>
>> Hi Neil,
>> Yes I'm still here, and to add to the irony, I have a half-finished
>> VCO based on the SSM2164. The shunt R-C networks on the input that
>> started this thread were a real pain to accommodate with surface-mount
>> components, unless they were put on the back of the board. The larger
>> DIL version would make things much easier.
>>
>> Phil (happy with A4 schematics)
>> ________
_______________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
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>
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