Zen mod has all the known threshold schematics on his bog. Find a thread he has replied to and look at the bottom where his links are.
tnx Elwood , post if you have more than in attached pdf
disclaimer - I can't remember where and from whom I snatched it 🙂
disclaimer - I can't remember where and from whom I snatched it 🙂
Holy cow. The regulator circuit in the PDF ZenMod posted is the same topology as the Naim NAP250 regulator by Julian Vereker:
It has horrible PSRR at higher frequencies, mainly because the VAS are referenced to the +/- rails and there's no CCS on the LTP. I was going to "fix" it by inverting the VAS (referencing ground), which also requires inverting the LTP, and then add a really simple CCS:
Attenuation of JV's regulator (green) and my inverted one (blue):
However, now I'm wondering. If it's good enough for Threshold, what am I missing?
Cheers,
Jeff.
It has horrible PSRR at higher frequencies, mainly because the VAS are referenced to the +/- rails and there's no CCS on the LTP. I was going to "fix" it by inverting the VAS (referencing ground), which also requires inverting the LTP, and then add a really simple CCS:
Attenuation of JV's regulator (green) and my inverted one (blue):
However, now I'm wondering. If it's good enough for Threshold, what am I missing?
Cheers,
Jeff.
Attachments
Yeah, I'm doing that with another amp, but I want to keep my NAP clone within the same ball-park as the original.
The power supply schematic is for the powers supply circuit inside the main FET 10e HL chassis. The remote power supply has just a torroid transformer, two electrolytic capacitors, a diode bridge, resistor and LED.
I never needed a schematic for the remote power supply since it is so simple.
I never needed a schematic for the remote power supply since it is so simple.
Now I have a question, I have the Threshold FET 10e P which is the phono stage. It has both balanced and RCA outputs, is it OK to hook up both the balanced and RCA outputs to separate preamps? I will only be playing either the balanced preamp/amp or the RCA preamp/amp.
ZM Knows Station 🙂
never laid my eyes on schmtc of that Beastie
try , if Rout is low enough , it'll work as charm
never laid my eyes on schmtc of that Beastie
try , if Rout is low enough , it'll work as charm