Thanks for the answer.
I think the problem is that I have two separate PSU's for +/-15V and +5V
and they are not connected other than through the AC lines and the corresponding
main earth line. I measure 5V between the 'digital' ground of the
+5V PSU and the 'analog' ground of the +/-15V PSU and as the CGS63 utilizes
the +5V line for the relays that is definitely wrong.
Now I'm trying to figure out how I need to connect both PSU's correctly.
Joachim
Am 18.01.2013 21:47, schrieb sasami@...:
I think the problem is that I have two separate PSU's for +/-15V and +5V
and they are not connected other than through the AC lines and the corresponding
main earth line. I measure 5V between the 'digital' ground of the
+5V PSU and the 'analog' ground of the +/-15V PSU and as the CGS63 utilizes
the +5V line for the relays that is definitely wrong.
Now I'm trying to figure out how I need to connect both PSU's correctly.
Joachim
Am 18.01.2013 21:47, schrieb sasami@...:
> Yes, the 741 output should do that to turn the relays on.
> Next, look at the collector of the transistor. That should go down to near
> zero volts. If it does, then you have problem with the relays, RCD, or the
> trackwork between them. If it doesn't, check the emitter really is connected
> to ground, and check the resistors between the 741 and the base and groud.
> The base should go to about 0.6 or 0.7 volts when the 741 output is at 14.2
> volts.
>
> Ken
>
>> Hi,
>>
>> yesterday I tested a PSU (+5V, +/- 15V) with a CGS63 Power Supply Delay but
> at the and of the relays
>> I get no voltage. I get +14.2V at pin 6 of the 741 (the output) and nothing
> at the link near RCO
>> so my guess is that I have a faulty BC 338. Or is the +14.2V wrong there?
>>
>> I have also posted this yesterday on Electro Music:
>> http://www.electro-music.com/forum/viewtopic.php?t=56546
>>
>> As there is no local store where I could get another BC338 to test my guess
> I would have to
>> order it from an online shop so it would be nice if anyone could comment
> whether the 741 is
>> behaving as expected.
>>
>> Cheers
>> Joachim
>>
>>
>> ------------------------------------
>>
>> The CGS Modular Synth home page: http://www.cgs.synth.net/
>> Yahoo! Groups Links
>>
>>
>>
>>
> _______________________________________________________________________
> Ken Stone sasami@... otherunicorn@...
> Modular Synth PCBs for sale <http://www.cgs.synth.net/>
> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>
>
>
> ------------------------------------
>
> The CGS Modular Synth home page: http://www.cgs.synth.net/
> Yahoo! Groups Links
>
>
>
>