Peter Lay (24)

1-07-2001 | At first glance, this circuit appears to be just a primitive microphone amplifier. Why then is the title of this article ‘Three-component Os...

1-12-2000 | With just a low cost DC adapter and the circuit described here it is possible to build a low cost stabilised, uninterruptible 9 V supply. On...

1-07-2000 | This circuit can precisely measure electrostatic charge. The charge to be measured is stored on C1 (a high quality MKT capacitor with a valu...

1-07-2000 | There is no such thing as complete protection against overvoltage damage due to a lightning strike. However, the risk of a valuable piece of...

1-12-1999 | The continuity tester is a handy adjunct to an ohmmeter. The unit or component whose continuity is to be checked is connected between term...

1-07-1999 | There are many different types of code locks, ranging from numeric keypads through chip cards and magnetic-card readers. The one presented...

1-12-1998 | The circuit is intended for carrying out harmless experiments with high-voltage pulses and functions in a similar way as an electrified...

1-09-1998 | This article describes an isolating transformer that is, in fact, composed of two standard transformers. Like a much more expensive comme...

1-07-1998 | The “chip card” consists of a small board on which an integrated circuit, IC1, forms the key. The logic circuit for the key is hard-wire...

1-07-1998 | The continuity tester can distinguish between high-, medium-, and low-resistance connections. When there is a conductance between the in...