| 41 very narrow crystal filter Good filters can be expensive and a manufactured one with a band-pass characteristic as good as the circuit de...
| 41 very narrow crystal filter Good filters can be expensive and a manufactured one with a band-pass characteristic as good as the circuit de...
| 16 R. Storn symmetrical voltages from a doorbel) transformer This circuit is of interest not merely because it uses a belt transformer with...
| acoustic telephone modem elektor february 1983 The modem described here is a circuit that is designed to send and receive digital informatio...
| 90 ring counter using timers The 558 quad timer hides four independent timers that are able to generate pulses with a pulsewidth ranging fro...
| With the aid of this device it becomes a simple matter to check the value of capacitors and inductors. When measuring an inductor (switch S2...