Hi all,
I've just started an electronic course in evening school and I'm studying a schematic of an old Moog synthesizer. I've got a question about the power rectification as attached in the image. As you can see, we go from 24VAC to +12V and -12V DC (necessary since the synth uses a lot of opamps). As I understand it, this is called "bipolar rectification", since you "rectify" AC voltage not to a single postive DC voltage, but to a positive and negative (hence "bipolar") voltage, correct?
Now, when I google "bipolar rectifier", most example circuits I find consist of a diode bridge (like for example the circuit in figure 8 (bottom) of this page: http://www.bristolwatch.com/ele/power_supplies.htm).
So the question is: are there any "advantages" or reasons why Robert Moog chose only two diodes, while "classic" bipolar rectifiers use a diode bridge? Cost effective? As I understand it (but correct me if I'm wrong), your capacitors have to be larger when you use only two diodes and the cost of two larger elco's is higher than using two extra diodes, no?
Any insights would be greatly appreciated!
Thanks,
Senne
I've just started an electronic course in evening school and I'm studying a schematic of an old Moog synthesizer. I've got a question about the power rectification as attached in the image. As you can see, we go from 24VAC to +12V and -12V DC (necessary since the synth uses a lot of opamps). As I understand it, this is called "bipolar rectification", since you "rectify" AC voltage not to a single postive DC voltage, but to a positive and negative (hence "bipolar") voltage, correct?
Now, when I google "bipolar rectifier", most example circuits I find consist of a diode bridge (like for example the circuit in figure 8 (bottom) of this page: http://www.bristolwatch.com/ele/power_supplies.htm).
So the question is: are there any "advantages" or reasons why Robert Moog chose only two diodes, while "classic" bipolar rectifiers use a diode bridge? Cost effective? As I understand it (but correct me if I'm wrong), your capacitors have to be larger when you use only two diodes and the cost of two larger elco's is higher than using two extra diodes, no?
Any insights would be greatly appreciated!
Thanks,
Senne