Mains Pulser The pulser is intended to switch the mains voltage on and off at intervals between just under a second and up to 10 minutes.  This is useful, for instance, when a mains-operated equipment is to be tested for long periods, or for periodic switching of machinery.  Transformer Tr1, the bridge rectifier , and regulator IC1 __

Mains Remote Alert Beeper and/or LED remotely-operated via mains supply line; Simple circuitry, easy to build units __ Contact: Flavio Dellepiane, fladello @ tin.it

Mains Slave Switcher Ii As a guide, a one-inch reed switch with 40 turns reliably switched on with the current flowing through a 150-watt lamp (approx.625 mA) but larger reeds may require more turns.  If the master appliance draws less current (which is unlikely with power tools) more turns will be required.  The reed switch is used to __

Passive filter cleans up power-line communications 09/20/01 EDN-Design Ideas Many applications require the design of custom analog filters (Reference 1].  The application for this design required simple and low-cost I/O filters for PLC (power-line communications], where low power consumption is a crucial factor.  Figure 1 shows the filters, which use passive components because of the requirement for low power consumption__ Circuit Design by Jose Sebastia and JJ Perez, Polytechnic University of Valencia, Spain

Remote Alert Beeper and/or LED remotely-operated via mains supply line; Simple circuitry, easy to build units __ Contact: Flavio Dellepiane, fladello @ tin.it

Carrier Circuits