Naim Snaps - how to make output voltages variable?

[_webwasher]

The early snaps provides two voltages, both determined by the fixed resistor values.
To power a nat 101 one output voltage variable would be perfect - how to change the voltage regulator circuit to variable the output voltage?

Many thanks.

 

[Pete MB&D]

You can find on line calculators for the resistor values or just change R1 to a variable resistor. Have a look on the data sheet on line.


Pete

 

[_webwasher]

Thanks Pete, that helps. What is the value is r1 now and what suggested for the pot?

 

[MJS]

IIRC you snip out the 820R resistor and put a 1k pot in there instead. It's the resistor on the bottom of the regulator board next to the regulator legs. You can also do this to a Hicap.

The NAT101 needs 24.5v +-0.02v.

 

[_webwasher]

Great, many thanks. That helps a lot.

 

[Roog]

The NAT101 needs 24.5v +-0.02v.

+/-0.02V would be/ is a very fine working tolerance, seems a bit ott .

 

[MJS]

It's 20mV and well within the capabilities of the DMMs we were using at the time.