Replacing IC SBF3A (Toestel of techniek)

door soundman2 , Wouw, 01-02-2014, 16:25 (4189 dagen geleden) @ vanderlevin
Gewijzigd door soundman2, 01-02-2014, 17:03

I need to replace a Philips IC in a record player 22GF603. I have lots of IC and wonder if anyone know a cross referense or a substitute?

/Johan van der Levin, Sweden

If you are skilled in electronics, you could try to use a normal operational amplifier.
The output of the opamp is connected to both bases of the output transistors.
A better performance can be obtained by adding a resitor of 150 ohms between the two bases and the emitters of the output transistors. Small loudspeaker currents flow through the resistor, preventing cross-over distortion.
The feedback circuit has to be connected to the negative input, the audio input of the amp with the positive input. Some redesign has to be carried out, but is not impossible.
The new (dual) ic should be mounted on a piece of experimenters board, which of the connection wires could be connected to the corresponding holes of the old ic.

Soundman2