| Batteries often go flat at the most inopportune moments. What's more, frequently, this is not detected until it is too Iate, but this ca...
H. Bonekamp (119)
| A current source based on one op amp can not easily be made variable, nor is the current very stable when standard resistors are used. T...
| Current souces ar e used in a variety of applications. They can be designed in a number of ways. One of the simplest is a common resisto...
| Even with a good frequency meter, it is well-rugh impossible to set two frequencies to a fraction of a hertz. It can, however, be done w...
| A generator is described that, based on the MAX038, provides triangle, sawtooth, sine, rectangular and pulse waveforms.
| A simple function generator is described, which provides rectangular, triangular and sinusoidal waveforms in the frequency range d.c.-1 00...
| This article describes an automatically operating night light with two remarkable features. First of all, a light-operated switch turns th...
| The circuit described here mimics the behaviour of a firefly, but only if you build more than one. Although it may be a bit bold to spea...
| The induction motor may be regarded as practically a constant speed machine: the difficulty of varying its speed economically constitutes...
| The controller was designed to stabilize the speed of small d.c. motors within certain limits. It holds constant the counter-e.m.f. prod...