HI, i present you "Mona", it uses bd679/680 as output transistors.
They are 40W darlingtons -> Q1+Q4+R1+R3 simulate bd679.
same for the downer side.
I forgot a cap in the fb, for DC protection.
Greetings, any oppinions would be welcome. 😉
They are 40W darlingtons -> Q1+Q4+R1+R3 simulate bd679.
same for the downer side.
I forgot a cap in the fb, for DC protection.
Greetings, any oppinions would be welcome. 😉
Attachments
Last edited:
Q5 and Q8 collectors are dangling.
J.
yes 😀
i use their junctions as diodes as vbe, they are mounted on the heatsink.
I am wondering why i get 100% better results without current mirror 😱
Look, harmonics here are 0.000...
only 6th is 5.43...
Look, harmonics here are 0.000...
only 6th is 5.43...
Attachments
Last edited:
mosfet54 you have received a PM. Please read it and follow the instructions before posting again.
Thank you.
i built the input stage on a breadboard and it not works, i am wondering is this from the breadboard's capacitance 😕 😡
ops is working perfect..
ops is working perfect..
yes 😀
i use their junctions as diodes as vbe, they are mounted on the heatsink.
Which still means collectors are dangling... because unlike simulated transistors, real ones have a limit to Ib.
But since you are into transmitting while talking to yourself, who cares.
little update:
output transistors bdx53c/54c are suitable as bd679/680.
mj11032/33 are for simulation only (their beta is changed in the simulator).
distortion is less without input LPF 😕
This time adjustable bias
from 4 to 114mA
output transistors bdx53c/54c are suitable as bd679/680.
mj11032/33 are for simulation only (their beta is changed in the simulator).
distortion is less without input LPF 😕
This time adjustable bias
from 4 to 114mA
Attachments
Last edited:
- Status
- Not open for further replies.
- Home
- Amplifiers
- Solid State
- 75W BJT amplifier "Mona"