Quick question on AC power (for fairchild 663)

[Jamie1234]

Hi, I'm sure this will be a quick and easy answer!  (I've built a few projects before but I don't really have any idea what I'm talking about.)

I've just obtained a fairchild 663 compressor (no sadly not a 660) for next to nothing, and want to set about powering and racking it up.

I have found a schematic (see pic) and it calls for 6.3v AC power. If it wanted DC I could have managed it fine (still have a JLM AC/DC kit lying around) but I have no idea how to go about providing it with AC.

Is it really as simple as hooking it straight up to a 240V/6.3V transformer like this one http://www.ampmaker.com/store/240V-6.3V-toroid-power-transformer.html

Or do I need to regulate it in some way as presumably the mains voltage (and therefore secondary voltage) will fluctuate?? And if so where do I start and could anyone point me to a schematic? Or am I out of my depth on this?

Cheers

Jamie

 

[gridcurrent]

from the manual.
Installation & Operation
The 663 Compact Compressor is designed to work into balanced or unbalanced circuits as shown in Figures 1, 2 and 3 attached.  It can be  powered by either 6 volts AC or 8 to 9 volts DC at 70 milliamperes.

 

[PRR]

> presumably the mains voltage (and therefore secondary voltage) will fluctuate??

*Study* the circuit.

6 V "AC" comes in pins 1-2. It goes to a *rectifier*. Now it is raw DC. (And you could instead run about 6 or 9 V DC into pins 1-2; the rectifier will take power either-way so it does not mind 1-way DC power.)

Then it runs to filter caps and dropping resistors, to a 6.2V ZENER.

If the designer did well, if you don't get too way-out on your feed voltage, the power to the rest of the circuit will BE 6.2V DC.

Also I rather think it would work over some range of voltages....

 

[Jamie1234]

Thanks!