Re: [Doepfer_a100] Pins and +5 volts from the power supply?
2001-12-24 by david.salter@reuters.com
Hi Bret,
The A100 does not have a 5V source as standard (unless your rack came with a midi interface). You need the 5V adapter. This is a simple little pcb that plugs into one of the plugs on the power bus. It then uses the +12V and converts to 5V using 7805 regulator and pushes the 5V onto the relevant bus line.
Regards
David
Bret Truchan
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Subject: [Doepfer_a100] Pins and +5 volts from the power supply?
23/12/2001 Header: Internal Use Only
23:58
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Doepfer_a100
Season's greetings everyone!
I'm experimenting with creating my own modules and ran into a big unknown.
The rack frame and power supply should supply +5 volts and +/- 12 volts.
However, it *seemed* (and I probably did something wrong) that the +5 volts
was not there. To check, I built a simple circuit with a resister, and used
a volt meter to check the presence of the +5 volts. Nada. This seems
strange, because all my modules are working just fine.
The LED next to +5 volts isn't on. The LEDs near +/- 12 volts is on.
Perhaps those LEDs turn on only when a module uses that power source?
Does anyone have experience in tapping into this +5 volt source? Can
someone instruct me how to build a simple circuit that uses this power
source?
Much thanks! I'm obviously more ambitious than experienced...
- Bret
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