DC Servo MOSFET Amplifier

[apexaudio]

Schematic in JPG

 

[apexaudio]

F100

Old F100 schematic and pcb will be redesign.

 

[apexaudio]

F100 with HITACHI mosfets

 

[coolet]

Apex pls check.

 

[apexaudio]

Amplifier model F100mkII
Nice work Coolet, thank U
R27 (1M) must be conect to amp out, C5(100n) must be connect to -56V in parallel with R10(100R), Q7 (BD139 ECB) can be move on heatsink with outputs, R12(4k7) can be variable resistor for BIAS adjust. It's not mistake but I prefer 0R1/5W in horisontal position not vertical.
Regards

 

[coolet]

Here it is

Pls check Trannies PINout... might be wrong.

 

[coolet]

Amplifier model F100mkII
Nice work Coolet, thank U
R27 (1M) must be conect to amp out, C5(100n) must be connect to -56V in parallel with R10(100R), Q7 (BD139 ECB) can be move on heatsink with outputs, R12(4k7) can be variable resistor for BIAS adjust. It's not mistake but I prefer 0R1/5W in horisontal position not vertical.
Regards

you have added some some errors ok i check it out tomorrow. I'll make 2 version for the 5w resistor.

 

[coolet]

a nice heatsink suitable for the F100mkII T0220 transistors. Salvage from a ATX power supply.

 

[apexaudio]

a nice heatsink suitable for the F100mkII T0220 transistors. Salvage from a ATX power supply.

No need to use heatsink for drivers.

 

[Tekko]

Sometimes the drivers needs heatsinks, depends on what their driving, a mosfet amp doesent really need hesatsinked drivers but some bjt output amps states in the schemo that drivers should be heatsinked.

I built the ESP P3A once and the drivers got ******* hot with no heatsinks.

Better to be safe than sorry.

 

[apexaudio]

Sometimes the drivers needs heatsinks, depends on what their driving, a mosfet amp doesent really need hesatsinked drivers but some bjt output amps states in the schemo that drivers should be heatsinked.

I built the ESP P3A once and the drivers got ******* hot with no heatsinks.

Better to be safe than sorry.

Depends of the value of emiter or source drivers resistor also. In this case with R20 390R and mosfets outputs no need to heatsinked drivers. Generaly I agree with 'Better to be safe than sorry'.
Regards

 

[apexaudio]

you have added some some errors ok i check it out tomorrow. I'll make 2 version for the 5w resistor.

Version with outputs on cooper side of pcb for easy montage outputs on heatsink, like on NX14 v2 will be great,
Regards

 

[coolet]

Version with outputs on cooper side of pcb for easy montage outputs on heatsink, like on NX14 v2 will be great,
Regards

reverse trani version

 

[coolet]

Horizontal 0R1 5W Version

 

[coolet]

Vertical 0R1 5W Version

 

[apexaudio]

Coolet You did Great job, thank's. Modern version of classic good topology, I think F100mkII have a future, only left to do version with HITACHI mosfets, which probably will be the best.
Regards

 

[apexaudio]

Coolet, there is some notification mistake on yours pcb:
C3(220nF) is replaced with C5(100nF)
R11(22k) is replaced with R9(68R)
C9(22pF) is replaced with C8(470pF)

 

[coolet]

Coolet, there is some notification mistake on yours pcb:
C3(220nF) is replaced with C5(100nF)
R11(22k) is replaced with R9(68R)
C9(22pF) is replaced with C8(470pF)

it was the copy n paste mistake

check if everything are ok before I post the final layout.

BTW what is the wattage of this classic amp for 8ohms

 

[khalsa]

hi coolet plz tell me your pcb design software

 

[coolet]

cadence orcad