Blackfeet
Input stage OPA134
Vas is a mirror
Output Diamond Lateral MOSFETs
Supply should be Transformer 2x22VAC = 2x30VDC
Data:
40 Watt
THD 0.000050%
Gain Margin 57dB
Phase Margin 81 Deg
Input stage OPA134
Vas is a mirror
Output Diamond Lateral MOSFETs
Supply should be Transformer 2x22VAC = 2x30VDC
Data:
40 Watt
THD 0.000050%
Gain Margin 57dB
Phase Margin 81 Deg
Last edited:
Thats just simulator "bliss". Why even use U4-7 ? Just drive Q1/2 directly with the op-amp.
And why are you using Mje340/ 350 , the models are not even any good. High cob garbage.
Use TTA/C004's.
Unless you are using the KT/Cordell models , you will get unrealistic output. I GAURANTEE
that does NOT do 1/2 PPM.
OS
And why are you using Mje340/ 350 , the models are not even any good. High cob garbage.
Use TTA/C004's.
Unless you are using the KT/Cordell models , you will get unrealistic output. I GAURANTEE
that does NOT do 1/2 PPM.
OS
Whatz up with C3 , blasphemy shunting the OPA's gain with a primitive shunt ?
Poor OPA , a proper EF zener based regulator with decoupling would be nice.
Your circuit does not have enough components .....
It is actually not so easy to make the goodness of the op-amp turn into 80-150W
(below) ... it was built. Widler mirrors amplified the op-amps current draw to create
almost PPM - for real. EF - mosfet would be easy to port.
Notice local decoupling , EF zener supplies. You gotta think everything out.
Edit - it actually has a servo to use the other half of the op-amp.
The local current draw of the servo zero's the output. slick !
OS
Poor OPA , a proper EF zener based regulator with decoupling would be nice.
Your circuit does not have enough components .....
It is actually not so easy to make the goodness of the op-amp turn into 80-150W
(below) ... it was built. Widler mirrors amplified the op-amps current draw to create
almost PPM - for real. EF - mosfet would be easy to port.
Notice local decoupling , EF zener supplies. You gotta think everything out.
Edit - it actually has a servo to use the other half of the op-amp.
The local current draw of the servo zero's the output. slick !
OS
Attachments
40.2 Watt output into 8 Ohm
THD 0.00006% at 1 Watt 1kHz
I have changed the compensation again to fit the oscilloscope simulation with perfect squarewave.
I will post the final version if somebody wants it.
THD 0.00006% at 1 Watt 1kHz
I have changed the compensation again to fit the oscilloscope simulation with perfect squarewave.
I will post the final version if somebody wants it.
Nice one Lineup! I like the designs you chern out. The gain and phase margins you state are huge at 57db and 81 degrees. I wonder how thats possible with such small caps. It should be rock solid stable with such margins.
Anyhow, I played alot with diamond arrangements like this. Placing a resistor between the Vas output and C3 always helped me achieving stability. Or a cap between the opamp output and its inverting input.
Much cheers!
Ruben
Anyhow, I played alot with diamond arrangements like this. Placing a resistor between the Vas output and C3 always helped me achieving stability. Or a cap between the opamp output and its inverting input.
Much cheers!
Ruben