Too early to tell, ELCOs need some 50-100 h to settle down, so hard work upfront me hehe
During this week we will make a comparative test...buzzing vs switching power supplies
Yes, SMPS is dead quiet. VSSA on +/- 45 V definately at its max. BC550C/560C are on the Vce edge but no problem, did hard clipp tests yesterday, I mean DC at input to clipp it totally on one side and vice versa, no sign of any troubles.
Sine clipp was at 86 Vpp, clear as nife cut like.
I've ordered SMPS500R (+- 45v) from conexxelectronic: Connexelectronic
I'm planning to use VSSA in 8 Ohms initially. I hope it can handle both channels
I'm planning to use VSSA in 8 Ohms initially. I hope it can handle both channels
Yes, SMPS is dead quiet. VSSA on +/- 45 V definately at its max. BC550C/560C are on the Vce edge but no problem, did hard clipp tests yesterday, I mean DC at input to clipp it totally on one side and vice versa, no sign of any troubles.
Sine clipp was at 86 Vpp, clear as nife cut like.
What if we use 2N5401/2N5551 instead of BCs?
I suppose it will be faster with smps switching frequency, PSU sideToo early to tell, ELCOs need some 50-100 h to settle down, so hard work upfront me hehe
I'm VERY interested to read your future comments.
Sacrifying the quality? Different pinout too. Is +/-45 V not enough for home use with normal speakers?
To be better performer than any other amp, in home environment of course.
Well, now it is time for those people that have build your amp to compare it agains some of good desing amps. This sounds very exciting
Did you try it with a non-regulated power supply?
can it drive 2 ohms speakers with no problems?
What is the signal to noise?
What is the input impedance?
sorry for many questions , but this amp looks like it is a very good amp and so far I like what I see from it
I've ordered SMPS500R (+- 45v) from conexxelectronic: Connexelectronic
I'm planning to use VSSA in 8 Ohms initially. I hope it can handle both channels
Calculate max output currents from both VSSA channels, since SMPS500R can give 7 Amax only and that's barely acceptable for proper full power stereo operation. Better to use one SMPS500R per channel.
VSSA's PSRR is the ratio between 1 Vrms (rail's AC) and 10 uVrms suppresed AC at the output, so 100 dB AC suppresion.
Hi lanchileWell, now it is time for those people that have build your amp to compare it agains some of good desing amps. This sounds very exciting
Did you try it with a non-regulated power supply?
can it drive 2 ohms speakers with no problems?
What is the signal to noise?
What is the input impedance?
sorry for many questions , but this amp looks like it is a very good amp and so far I like what I see from it
QA:
Yes. Look few posts back.
Yes, as long as output RMS current doesn't exceed 8 A. Output is short circuit stable (when no signal is present). Output impedance is less than 10 mOhms at 20 kHz, measured at PCB's output pin.
S/N: better than -100 dB
10 kOhm
It's even better than it looks.
Wow. all looks very good Lazy cat. Now is time to put this beast to the test!
I have some candidates:
a) 2sk1058 2sk2221 irfp9240 mosfet amplifier schematic
b) HPA-nxV200 180 watt MOSFET Audio Amplifier Module
c) Greg's Web Site
d) http://www.diyaudio.com/forums/pass-labs/121228-f5-power-amplifier.html
I am rooting for the M400!
I have some candidates:
a) 2sk1058 2sk2221 irfp9240 mosfet amplifier schematic
b) HPA-nxV200 180 watt MOSFET Audio Amplifier Module
c) Greg's Web Site
d) http://www.diyaudio.com/forums/pass-labs/121228-f5-power-amplifier.html
I am rooting for the M400!
VSSA's PSRR is the ratio between 1 Vrms (rail's AC) and 10 uVrms suppresed AC at the output, so 100 dB AC suppresion.
VSSA test measurements with square waves. Input low-pass filter set to 970 kHz (-3 dB), output RC filter installed.
1. Plot - 50 kHz, 8 Ohm load
2. Plot - 100 kHz, 8 Ohm load
3. Plot - 200 kHz, 8 Ohm load
4. plot - 50 kHz, 1 Ohm load
1. Plot - 50 kHz, 8 Ohm load
2. Plot - 100 kHz, 8 Ohm load
3. Plot - 200 kHz, 8 Ohm load
4. plot - 50 kHz, 1 Ohm load
Attachments
VSSA schematics from my signature bellow.Which schematic was used for the amp shown in post # 798 ?
This place is littered with schematics with small variations of the SSA.
Gets quite confusing regarding who is trying what !
Wow. all looks very good Lazy cat. Now is time to put this beast to the test!
I have some candidates:
a) 2sk1058 2sk2221 irfp9240 mosfet amplifier schematic
b) HPA-nxV200 180 watt MOSFET Audio Amplifier Module
c) Greg's Web Site
d) http://www.diyaudio.com/forums/pass-labs/121228-f5-power-amplifier.html
I am rooting for the M400!
VSSA would be a clear winner sound-wise, no doubt about it.
L.C. May-be you did not had noticed yet, but I've mentioned several times that your link in signature does not work.VSSA schematics from my signature bellow.