no
pentodish part on top, in that arrangement, means enough of effective impedance to shield from rail ripple
if you want to kill it completely, lead speaker return to positive rail
relocate shunt resistor too
but always be aware that said output terminal is on 60Vdc potential; it'll not kill or zap, but it can make damage, if not handled with care
pentodish part on top, in that arrangement, means enough of effective impedance to shield from rail ripple
if you want to kill it completely, lead speaker return to positive rail
relocate shunt resistor too
but always be aware that said output terminal is on 60Vdc potential; it'll not kill or zap, but it can make damage, if not handled with care
The SIT has a low Drain impedance, which means that any noise
appearing between Source and Drain pins will result in noise current.
If either of these pins are attached to a noisy voltage and the other to
the load, the noise will go through easily.
For this reason the SIT-3 has its drain attached to ground, and the rest
of the circuit, which looks at the minus rail, is designed not to conduct
noise.
Of course a quiet regulated supply is always nice....
kasey197, I built mono-blocks of that circuit with THF-51S output, powered by a CLC supply: 22mF - Hammond 159ZJ - 22mF. The ripple according to PSUD is less than 2mV.
The amps are quiet enough for my 103dB speakers. The voltage may vary a bit depending on line voltage, but that has not been a problem as far as I can tell.
The amps are quiet enough for my 103dB speakers. The voltage may vary a bit depending on line voltage, but that has not been a problem as far as I can tell.
Thanks folks for the super useful pointers and advice!
I was looking for something for me to mess with while waiting for the more advanced SIT designs here to settle down. Generg kindly sent me some sims to help me scratch that itch!
Soooo... think something like this below is close enough to the tried and tested so that I don't go far off the reservation ..
DC coupled.. leaving open experimentation with a x-SIT and nfb
Some used SITs on the way from China so that will be another interesting thing to investigate !
I was looking for something for me to mess with while waiting for the more advanced SIT designs here to settle down. Generg kindly sent me some sims to help me scratch that itch!
Soooo... think something like this below is close enough to the tried and tested so that I don't go far off the reservation ..
DC coupled.. leaving open experimentation with a x-SIT and nfb
Some used SITs on the way from China so that will be another interesting thing to investigate !
Attachments
So a DF of around 3 should work just fine for my JBL array 1400’s - their impedance hovers mainly between 6 to 8 ohms, so we’re talking about less than 1db of variation caused by the amps output impedance.
This single ended hulk is going to make a fine occupant for a large chassis obtained when we lived in HK.... A bit dusty and a few scratches but nothing that some spit and polish won’t erase
Anyone any ideas which smps to suggest ? I really like ben’s psu but I’m going to save that for an open chassis build later....
This single ended hulk is going to make a fine occupant for a large chassis obtained when we lived in HK.... A bit dusty and a few scratches but nothing that some spit and polish won’t erase
Anyone any ideas which smps to suggest ? I really like ben’s psu but I’m going to save that for an open chassis build later....
Attachments
