I designed the psu for Ale Moglia Gyrator with PSUDII using one old Audionote DAC power transformer, I guess is OK, could anybody more skilled confirm?
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4P1L operating point (Ua, Ia, Ug)?
IMHO 153V as B+ is in the low side for Ale's gyrator loaded 4P1L (if you use it in the 20-30mA region).
150VDC-200VDC 30mA as per build instructions, also can design with more VDC but increase ripple.
Hi Felipe,
2,4K resistor is dropping 150V and burning 9W. This is too much heat, and too much stress on the transformer (117ma rms).
By adding a choke-input filter, you can reduce the Trafo current to 63mA rms, while reducing the dropper R's heat to 1,1W - and still increasing the dc output to 186V dc (for similar level of ripple).
Using a choke-input filter is always the best for high-quality work - it reduces peak and rms trafo current, improves regulation, and reduces noise-coupling.
When your trafo rms voltage is higher than the desired dc voltage, this advantage is even greater!
2,4K resistor is dropping 150V and burning 9W. This is too much heat, and too much stress on the transformer (117ma rms).
By adding a choke-input filter, you can reduce the Trafo current to 63mA rms, while reducing the dropper R's heat to 1,1W - and still increasing the dc output to 186V dc (for similar level of ripple).
Using a choke-input filter is always the best for high-quality work - it reduces peak and rms trafo current, improves regulation, and reduces noise-coupling.
When your trafo rms voltage is higher than the desired dc voltage, this advantage is even greater!
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Try to find an industrial transformer winder in a location near to you. Give the values of L, R and voltage from PSUD2, and see if they can make it.
If that does not succeed, there's always Hammond:
Hammond Mfg. - D.C. Filter Chokes - (153 - 159 Series)
Beware of cheap, when working with high-voltage iron! This is not a place for poor quality.
If that does not succeed, there's always Hammond:
Hammond Mfg. - D.C. Filter Chokes - (153 - 159 Series)
Beware of cheap, when working with high-voltage iron! This is not a place for poor quality.
you can increase the value of R in the choke. Model in PSUD2 and see what you can tolerate - higher R may reduce cost.
Peak current is about 85mA - see I(L1). Remember, the L value of a choke is given for the current stated on it's specification. It reduces at higher current.
There's no real problems with your sim.
Add the R value of Hammond - if you choose one of their chokes, no problem. You can reduce the dropper R value, if you like.
There's no real problems with your sim.
Add the R value of Hammond - if you choose one of their chokes, no problem. You can reduce the dropper R value, if you like.
DHT preamp is only one tube, 3-4 resistor, one capacitor....and 10kg PSU. 🙂
The total cost has same dispersion.
The total cost has same dispersion.
You are right🙂
I will use the same Bartolucci power tx and the two 10H 100W chokes than used for 26 B+😉
I will use the same Bartolucci power tx and the two 10H 100W chokes than used for 26 B+😉
