various electronic circuit s

amplifier analog-mixed-application anode assembly background black blank cathode chip circuit closeup component concept developing- -marketing diac diode diodes electrical-engineering electronic-components electronic-engineering electronic-industry electronic-parts electronics engineering equipment hardware industry-engineering integrated-circuit isolated light-emitting-diode npn object technics-lab plastic pnp polarity semiconductor semiconductor-manufacturing semiconductor-products set silicon silicon-diode spare-part technical-bench technical-college technology tool top-view transistor white