ok thx..now i am thinking about symmetrical supply b1 buffer.i didnt understand why nelson used capacitors ?
Because its unconditionally safe for not passing/producing DC in any bad source occurence or failure circumstance, which can lead in electrodynamic speaker destruction if used with DC coupled amps like the F5.
i can print and do myself because of shipping etc expensive..which one is better ? and do they work?
This is not the thread for that. Moving your question to the dedicated thread.
It simply will not work. Has to be referenced somewhere. With single supply that is half psu. You mix two different things. The symmetrical psus allow no input or output caps. The single ended psu does not. Its either you make the original B1 or the symmetrical supply spin off. Using an output capacitor for the symmetrical one is pure precaution with DC coupled amps like the F5. Using both input and output caps on the original B1 is mandatory.
B1 in an active filter?
The B1 buffer is essentially a voltage follower.
A voltage follower is also an essential part of a Linkwitz-Riley filter.
See this: Active Filters
Has anyone tried the B1 voltage follower as a component in a Linkwitz-Riley filter?
The B1 buffer is essentially a voltage follower.
A voltage follower is also an essential part of a Linkwitz-Riley filter.
See this: Active Filters
Has anyone tried the B1 voltage follower as a component in a Linkwitz-Riley filter?
B1-converted D/A-converters?
Lampizator is a CD-player or a DAC modification. The idea is to replace the active op-amp filters and buffers after the D/A-converter with a single-ended triode amplifier stage, thus avoiding numerous transistor stages of the op-amps.
I thought that basically the same could be done with a simple Class A JFET amplifier, possibly using a B1 stage. Because B1 is a voltage follower buffer, it could be developed to a Linkwitz-Riley low-pass filter, like I said in my previous post.
Read this too: http://www.diyaudio.com/forums/tubes-valves/153345-how-lampizator-cd-tube-player-sound.html
Lampizator is a CD-player or a DAC modification. The idea is to replace the active op-amp filters and buffers after the D/A-converter with a single-ended triode amplifier stage, thus avoiding numerous transistor stages of the op-amps.
I thought that basically the same could be done with a simple Class A JFET amplifier, possibly using a B1 stage. Because B1 is a voltage follower buffer, it could be developed to a Linkwitz-Riley low-pass filter, like I said in my previous post.
Read this too: http://www.diyaudio.com/forums/tubes-valves/153345-how-lampizator-cd-tube-player-sound.html
This is a perfect application for a B1 type circuit. For LR4, you probably need 3 B1 circuits, one as input buffer and another for every L2 Butterworth stage.The B1 buffer is essentially a voltage follower.
A voltage follower is also an essential part of a Linkwitz-Riley filter.
See this: Active Filters
Has anyone tried the B1 voltage follower as a component in a Linkwitz-Riley filter?
HTH
Doug
The B1 buffer is essentially a voltage follower.
A voltage follower is also an essential part of a Linkwitz-Riley filter.
See this: Active Filters
Has anyone tried the B1 voltage follower as a component in a Linkwitz-Riley filter?
I agree, it seems like an ideal application for B1. It is on my list of things to do "real soon now".
I agree, it seems like an ideal application for B1. It is on my list of things to do "real soon now".
I don't really know what i'm doing, but in LTSpice I knocked up a pair of Salas's direct-coupled B1-type buffers in 24dB L/R high-pass, and apart from an enormous insertion loss, it performs as I expected. Oh, and with more than 0.015% THD+N @10kHz but I suspect that's due to the sim looking at everything up to 200kHz. I'd really like to build this to test it, as I'm keen on attempting to bi-amp my system. Should I start a thread on it? I haven't managed to find anything really complete on the 'net so far (so far~) about active crossovers without opamps.
Last edited:
...a pair of Salas's direct-coupled B1-type buffers in 24dB L/R high-pass, and apart from an enormous insertion loss, it performs as I expected...
I don't see any reason for this insertion loss. And as far as I remember, there was none in my simulations. I think you did something wrong.
Oh, and with more than 0.015% THD+N @10kHz but I suspect that's due to the sim looking at everything up to 200kHz.
You should not trust the THD+N simulations of spice too much. Just regard it as a tendency.
regards
Flo
- Home
- Amplifiers
- Pass Labs
- B1 Buffer Preamp