Finished full stabilized 1200W power supply for my new project
Finished full stabilized 600W + 600W power supply for my new project - class A 50W power monoblocks. 1F+1F capacity inside🙂
Finished full stabilized 600W + 600W power supply for my new project - class A 50W power monoblocks. 1F+1F capacity inside🙂
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Thank You very much!🙂
The scheme drawn on a large sheet of paper, then scan. The power supply unit has 4 independent lines of the power supply (+\- 26 V, LT1083CP) and 2 for voltage amplifier (+\- 26 V & +\- 15 V, LT337\LT317)
I did it in Sprint Layout🙂
Is better to open in a new window
Diodes KD2989 - ultra fast 20A/100V (Rus)
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Ok, why the multiple paralleled rails with LT1083 vregs and the excess filter capacity before, and after??
The LT1083 tops out at 7.5 amps, and while ur building a 50w class A amp, should it drive say a 2ohm load and you run into AB, there will be very big current spikes to recharge those caps...
I'd have opted for old school chokes, and maybe a cap multiplier in the mix as a possible solution.
What's the amp circuit consist of??
Nice looking construction, and a lot of work put in...
The LT1083 tops out at 7.5 amps, and while ur building a 50w class A amp, should it drive say a 2ohm load and you run into AB, there will be very big current spikes to recharge those caps...
I'd have opted for old school chokes, and maybe a cap multiplier in the mix as a possible solution.
What's the amp circuit consist of??
Nice looking construction, and a lot of work put in...
I had the same question about the big capacitors after the regulators, but i thought the 12 ohm resistor in series is there to limit the charging current a bit. 🙂
R51, R52 - 10 Ohm, R57, R58, R59, R60, R65 and R66 - 1.2 Ohm. All this resistors limiting the current of charge.
Chips LT1083CP are not connected in parallel - they will ensure supply of different pairs of output transistors - my new project will have a lot of output stages with the high-frequency transistors of medium power, type 2SC5171 and 2SA1930. Total quiescent current will be about 3 amps.
The energy intensity of power supply of each channel is 470 J - is very good for music🙂
The advantage of the capacitance after the regulators is that the capacitors supply the change in current demand from the ClassA amplifier. The regulators then try to recharge the capacitors back to their DC voltage.
This way the speakers can demand enormous currents that the regulators do not need to pass.
This way the speakers can demand enormous currents that the regulators do not need to pass.
If I understand You correctly (my English is not very good), then I agree completely🙂 Large capacity after stabilizers provide benefits, but need a soft start. Here is my previous amplifier, which was made on the same principle and working in my audio system from 2009 year. Output stage - 41xBUF634T in parallel for one chanal.
10W in class A (8 Ohm) or 20W (4 Ohm), but run into AB after 10W.
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A hypothetical question...in case of using the regulator with a pass transistor fed from unregulated supply would this big output capacitor slow down the response of the regulator to the input small changes?
Best regards.
Best regards.
The transformer needs a soft start. To limit the current at start up of the transformer.
The capacitor bank needs a slow charge. To limit the rate of voltage increase across the capacitors.
These are quite different.
The capacitor bank needs a slow charge. To limit the rate of voltage increase across the capacitors.
These are quite different.
No.
The regulator is unaffected, there has been no change to the regulator circuit.
The voltage step/change applied to the output of the regulator is slower. The result of this slower (less slew) change is that the regulator performs within it's passband better. It never sees the fast slew impulses that could be applied and could cause the regulator to become unstable.
Look at some LDO regulators. The datasheet usually shows a "no go" range of values for the output capacitance.
Very small values are OK, very large values are OK. A wide range of middle ground values are prohibited.
Low ESR is often restricted as well. i.e don't stick a film cap in, where an electrolytic will do much better.
Excellent piece of information and it confirms the simulation results i got in ltspice. Thanks a lot for the clarification. 🙂
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