| This circuit ensures that messages received by a radio or transceiver are automatically recorded on a cassette or tape recorder. lt is as...
Amrit Bir Tiwana (23)
| This tiny circuit can be used as a movement alarm in many situations: in a suitcase or on a bicycle to name but a few.
| The design of this amplifier is based on the assumption that, since the collector current of a transistor is, roughly, the same as the e...
| Pulse width modulation (PWM) is Ideal for controlling small electric PCB drills that draw currents of up to 2 A. Larger currents are poss...
| The indicator shows by means of two LEDS when the signal level in either charmel of a stereo audio system exceeds a preset value.
| The circuit of the frequency doubler may be looked at from different angles. With input signals >=1V, T2 and T3 operate as full-wave rec...
| To keep the converter simple, it contains no preset controls, which means that the level of the output voltage is dependent to some degree...
| A symmetrical power supply may be designed from two standard opamps, but it can only provide a small current (of the order of a few mA).
| A simple unit for testing an audio, TTL or CMOS circuit is always useful. Here, an oscillator, based on IC(1a), generates a frequency tha...
| The tester cannot only detect rectangular-wave signals. It can also generate them. The test signals may be generated continuously or for a...