Lower voltage is OK but don't believe the 100V label. There is a reason you will only find these caps on ebay.Doesn't matter it has a lot of total capacitance. The amplifier has a +-55V , maybe smaller voltage supply.
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Sorry, I only saw this Question right now.
Here is a link to the errata doc covering both amplifiers and PSU +Protect
Updates and Errata – nx-Amplifier | hifisonix.com
I just built a second nx-Amp 2 weeks ago with Jims Audio boards and the updates per the errata sheet. Works perfectly.
Uncharacteristically, I am going to blow my own trumpet here: this is an awesome sounding amp (I'm using B&W 703's, my X-Altra mini preamp and an Oppo BD-103 player).
Power transformer is 500 VA, with belly band and inter winding screen.
I will attest to the superb sound of this design. I just finally wired all three boards wired up the way they were intended and listened to it all day. Wow! I actually hooked mine up to the scope and an 8R dummy load and I'm getting 120W with +-50V rails. Very clean Square waves all the way to 100mhz. Thanks for staying with it and getting the circuit working with the new boards.
Blessings, Terry
not even entry class beauty , but here is my way of doing things when i was unable to find it easy to print on pcb. Used veroboard and made design on paper to remember things. These are 3 channels using old 2SD313 2N5401 and 2n555. Giving approx 50 watts of power on +/-40 supply. going for 5.1 setup. If i got time after this one will go for better designs.
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Joined 2009
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I love the method used !
It can be seen in some old gear.
(Terry, you naughty boy)
Finished amplifier
THD and IMD for SARA amplifier...
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Thank you all for comments ,and realy sound very clear ,no hum , hiss ,buz . I'm glad I have built
My speakers are Taga Harmony Platinum F-120, and more pictures
Really nice job! clean layout and well executed!
Congrats!
Do
I can't read the THD due to the dominance of mains harmonics out beyond 6kHz.
THD aprox 0.0002% ; THD+N is obviously bigger, 0.001% if I remerber...
I was re-routing the cables inside the chassis, I was finding new position for the transformers and the noise going down a lot. After new measurements, we have a new results. Real THD at 1khz it is almost like in simulation, except 3th harmonic wich is generate in over 90% from measurement sistem. IMD-( 19khz+20khz ) with 1khz related product it is smaller then the noise. In simulation that product it is at -139dB from the 19khz+20khz signals.
In first photo it is the measurement sistem THD, in a second photo it is a THD of a measurement sistem + SARA power amplifier at 80W-8ohm.
In first photo it is the measurement sistem THD, in a second photo it is a THD of a measurement sistem + SARA power amplifier at 80W-8ohm.
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6 channel (5.1) amplifier
This is my "Jugaad Amplifier". Jugaad is an Asian word for "an innovative fix or a simple work-around".
Speaker protection circuits with relays for all six channels. working fine in initial tests and simulations.
6 channels amplifiers (no awesome pcb here therefor Jugaad )
Work in progress:
Hefler matrix and switching circuit for various modes.
This is my "Jugaad Amplifier". Jugaad is an Asian word for "an innovative fix or a simple work-around".
Speaker protection circuits with relays for all six channels. working fine in initial tests and simulations.
6 channels amplifiers (no awesome pcb here therefor Jugaad )
Work in progress:
Hefler matrix and switching circuit for various modes.
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Natali PRO, H-klasse 500+500W, +50/100V, speaker protection, thermal protection, temperature indicator, clip limiter.
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This is my "Jugaad Amplifier". Jugaad is an Asian word for "an innovative fix or a simple work-around".
Speaker protection circuits with relays for all six channels. working fine in initial tests and simulations.
6 channels amplifiers (no awesome pcb here therefor Jugaad )
Work in progress:
Hefler matrix and switching circuit for various modes.
nice jugaad amplifier kit
Member
Joined 2009
Paid Member
Natali PRO, H-klasse 500+500W, +50/100V, speaker protection, thermal protection, temperature indicator, clip limiter.
Looks like a lotta power in a small case - impressive !
Interesting use of an older speaker frame to hold your toroid
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