[sdiy] BIG PSU ISSUES

[Dan Snazelle]

the -12 volts if for the 10 plus opamps in the circuit.....

the regulator is just a typical IN GND OUT.

There is only one gnd and it is tied to the 2 SENSE posts.

my grounds are all connected together. although i was getting a higher voltage reading PRE distro board (which i figured out was because of the 22r resistors and maybe the regulator)

thanks

--------------------------------------------
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


> Subject: RE: [sdiy] BIG PSU ISSUES
> Date: Wed, 13 Aug 2008 16:58:06 -0700
> From: Barry.L.Klein at wdc.com
> To: subjectivity at hotmail.com
>
> How is your 6V regulator wired - between +12V and ground?
> Are there 2 grounds on the supply that you must connect - sometimes they
> have 2 separate circuits....
> Are grounds connected between all your cards and supply?
> Voltage at load and supply will be the same. If not, your grounds are not
> connected together and you are using a local ground for your voltage meter
> in each case...
> What takes -12V in a CMOS circuit...? watch out, don't fry your boards...
>
>
> Barry
>
>
> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Dan Snazelle
> Sent: Wednesday, August 13, 2008 2:30 PM
> To: raywilson at comcast.net; synth-diy at dropmix.xs4all.nl
> Subject: RE: [sdiy] BIG PSU ISSUES
>
>
> 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
>
>
> http://www.indie911.com/dan-snazelle
> (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
>>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy