Great stuff here folks - thanks for all the input. I'm sure this will be useful to more people than just me.
One further thing that I've noticed is Andy's statement in the documentation which says:
I'm going to be using the SR to power two gain stages. Each of these has the power rail decoupled by 56uf oscons. The power rail to each gain stage is, however, fed via a 27R resistor. Does this mitigate the above quote?
Further, as I'll only be running ~19v into the 27R, should I swap it for a lower value? For example (and here my lack of knowledge of electronics starts to show):
At the moment, voltage across the 27R is 24.4v, therefore I assume there is a voltage drop before the gain circuit, which must have less than 24.4v across it. I understand the 27R is there to present a load to the PSU to draw a specific current. If I'm going to put ~19v across the 27R, I'm changing 2 things: the current draw and the voltage across the gain stage. Should I change the 27R for a new value? Remove it entirely? Perhaps measure the voltage across the gain stage after the 27R and match it accordingly? Help!
This sure is a learning process!
Cheers,
Carl
One further thing that I've noticed is Andy's statement in the documentation which says:
Andrew L. Weekes said:...care has to be observed with the load presented to the regulator by the ciruit being powered. Specifically, small film or ceramic capacitors close to the regulator will almost guarantee instability and oscillation.
Page 11, section 9.4 (Performance Verification)
I'm going to be using the SR to power two gain stages. Each of these has the power rail decoupled by 56uf oscons. The power rail to each gain stage is, however, fed via a 27R resistor. Does this mitigate the above quote?
Further, as I'll only be running ~19v into the 27R, should I swap it for a lower value? For example (and here my lack of knowledge of electronics starts to show):
At the moment, voltage across the 27R is 24.4v, therefore I assume there is a voltage drop before the gain circuit, which must have less than 24.4v across it. I understand the 27R is there to present a load to the PSU to draw a specific current. If I'm going to put ~19v across the 27R, I'm changing 2 things: the current draw and the voltage across the gain stage. Should I change the 27R for a new value? Remove it entirely? Perhaps measure the voltage across the gain stage after the 27R and match it accordingly? Help!
This sure is a learning process!
Cheers,
Carl