The presented circuit uses a PNP transistor, which can be the BC558. Observe the polarity of the supply. The circuit is suggested by Texas Instruments opto-electronic documentation.
This amplifier must be supplied with a voltage of 24 V and the resting current is of the order of 4...
This circuit was discovered in an English publication in 1979. The circuit can still be assembled with...
This converter was found in the June 1991 issue of Radio Electronics magazine. The circuit uses...