jzaghal
Full Member level 2
Problem TDA7250 ??
Hi Everybody,
I have built an amplifier around this chip.
It uses BDW93C and BDW94C Darlington output.
The Power Supply is arround +/- 30 Volts.
The design works beautifully, very clean output that goes
in the 200KHz range.
However .....
One little annoying problem, which I could not solve:
Only CH1 quiescent current is high at arround 130 mA.
CH2 is perfectly alright.
I measure the voltage between the -ve Supply and the Collector
of the PNP, on CH1 measures 0.013V (across the 0.1 Ohm ).
CH2 voltage is 0.00V which is as it should be.
Of course CH1 gets warm after a while, but waste of power.
I changed the TDA, but same problem.
Finally I used the same circuit that Gulson has used.
Any help appreciated.
Thanks 8O 8O
Hi Everybody,
I have built an amplifier around this chip.
It uses BDW93C and BDW94C Darlington output.
The Power Supply is arround +/- 30 Volts.
The design works beautifully, very clean output that goes
in the 200KHz range.
However .....
One little annoying problem, which I could not solve:
Only CH1 quiescent current is high at arround 130 mA.
CH2 is perfectly alright.
I measure the voltage between the -ve Supply and the Collector
of the PNP, on CH1 measures 0.013V (across the 0.1 Ohm ).
CH2 voltage is 0.00V which is as it should be.
Of course CH1 gets warm after a while, but waste of power.
I changed the TDA, but same problem.
Finally I used the same circuit that Gulson has used.
Any help appreciated.
Thanks 8O 8O