[quote author="sqkybeaver"]the 5v regulator is used as a stable reference for the voltage regulator and the current limit. the transistor has to meet a certain voltage before current will flow. so the max voltage will be a volt or 2 lower than the input voltage. same as the lm324(Vcc - ~1.5)[/quote]
So if I replace the lm324 with the lf147 which has a max voltage of 44V i should be able to use higher voltage transformer, right?
There are modification to be performed on the scheme in order to change the Opamp?
[quote author="sqkybeaver"]to have a dual voltage supply, you would need an transformer with 2 isolated outputs, and 2 of these circuits.[/quote]
sorry to bother you but I can't figure out how to use two of this circuit to obtain a dual power supply, I followed you down to using two isolated secondary of the transformer, but then you have to connect the two regulating circuits together somehow, in order for the currents to circulate correctly, right? how do you do that?
[quote author="sqkybeaver"]the board is designed not ho hold the transformer, and to be isolated, the middle is an earth ground.
using two of these in series the center can be tied to earth and you could get a + ground - dual supply. or you can have 2 common grounded supplies.[/quote] Can you post an example of such a connection? would be necessary a center tapped transformer? would a 200 VA dual 20V((20*1,4)-1,4 =+-26,6V after rectification) toroidal transformer suffice ? What would be the changes to the circuit to have, lets say +-35V@5A output?
I posted an idea for a similar project on seeedstudio/wish and I'm planning to use a papilio one as a prototyping platform for the early stages and lower res prototype. There is also a discussion on the same topic on gadget factory forum. I'm not allowed to post links yest as I'm new to this forum but i will . I hope we can join the forces in a common effort :)
