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
<clone45@hotm To: Doepfer_a100@yahoogroups.com
ail.com> cc:
Subject: 1 Pins and +5 volts from the power supply
23/12/2001 Header: Internal Use Only
23:58
Please
respond to
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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