More about current (255)

1-12-1990 | A monostable relay has two states: operative when a large enough curreut flows through its coil and quiescent when no current flows. A re...

1-12-1990 | The "portable battery charger" described earlier in this supplement may be extended by a current source that ensures a constant current t...

1-12-1990 | The electronic antenna selector is intended to switch between two FM antennas by means of a legte signal.

1-10-1990 | A portion of the current-voltage characteristic of certain devices, such as the thyristor, the tunnel diode and the magnetron, has a negati...

1-09-1990 | The TDA1522 from Philips Components is a preamplifier chip for tape and cassette recorders. The circuit presented here is remarkable for...

1-09-1990 | A conventional current gain tester is too unreliable for measuring and comparing the d.c. gain of power transistors because it fails to se...

1-07-1990 | A standard voltage regulator Type 7805 is inexpensive and easily available, but its maximum current of 1 A can at times prove a handicap....

1-07-1990 | An isolating amplifier, also called buffer, is used to match two dissimilar impedance points and isolate one stage from a succeeding one...

1-07-1990 | Sine wave oscillators normally generate near-perfeet sine waves, but the stability of their output signal is often not very good. The circui...

1-05-1990 | The circuit described here makes use ot a computer to plot the so-called output characteristic and determine the small-signal current gain...