i dont want to design ops driven from the one side (up or down)
i want audio injection like here.
i am not using double (symetric) bootstrap because i think its possible to make amplifier more prone to oscillation ?
Or it makes oscillation but these capacitors shorten out it ? C1,C2,C3,C4
Attachments
You can only get a +-15volt swing as TL07* will only work up to +-18V rail.
Lots of power lost in heat from the 15 or so volts drop across the output transistors.
Lots of power lost in heat from the 15 or so volts drop across the output transistors.
Most people would have some emitter resistors on those outputs. And unless
this is for a headphone amp those output devices are sort of wimpy. That device
is in a small package that's hard to conduct the heat from i wouldn't want to use it above
about 5w even on a good heatsink.
this is for a headphone amp those output devices are sort of wimpy. That device
is in a small package that's hard to conduct the heat from i wouldn't want to use it above
about 5w even on a good heatsink.
they are 40W and again for the test, im curious to see what happens 😀
emitter resistors are not needed if there's no protection
Im puzzled because i found two formulas for Pd ->
(1/p^2)*(Vcc^2/Rload)
and
(1/p)*(Vcc^2/Rload)
2nd formula outs higher Pd.
emitter resistors are not needed if there's no protection
Im puzzled because i found two formulas for Pd ->
(1/p^2)*(Vcc^2/Rload)
and
(1/p)*(Vcc^2/Rload)
2nd formula outs higher Pd.
Last edited:
ahh i built it using old transistors and maybe their beta is lower than the simulation data.
i get 40 mV across 100 ohm lamp between emitters -> 0.4 mA Iq
this is when pot is set to Max -> must be 214 mA
@ Minimum position -> 2.3 mA
i get 40 mV across 100 ohm lamp between emitters -> 0.4 mA Iq
this is when pot is set to Max -> must be 214 mA
@ Minimum position -> 2.3 mA
Ahh it was a mistake, i was reversed transistor pins.
it was BCE now is ECB for those packages 😀
It sounds veery goood 😛
losing my time
No heat at all with big speaker but i cant get high volume, i dont know why.
P.S. Transistor failed when i pushed the low freq eq high and the bass kicked in 🙁
Heatsink cold but maybe these transisors are small and there are peak currents
Maybe they are useful for bi-amping for mid and high frequency
it was BCE now is ECB for those packages 😀
It sounds veery goood 😛
losing my time
No heat at all with big speaker but i cant get high volume, i dont know why.
P.S. Transistor failed when i pushed the low freq eq high and the bass kicked in 🙁
Heatsink cold but maybe these transisors are small and there are peak currents
Maybe they are useful for bi-amping for mid and high frequency
Last edited:
Just a reminder to play by the rules here. No one is under any obligation to contribute to the thread... and mosfet, you might do better to try and listen to all the advice that is being given and try and see one thread through to a meaningful conclusion rather than keep starting new ones.
- Status
- Not open for further replies.