PIC CARILLON

THIS design produces bell-like sounds, using the multiple harmonics of sinewaves to give the tonality expected from bells, complete with the decay of each note played. In its simple standalone form, as described here initially, it is triggered by a 4 × 4 matrix data keypad. This allows the 12 notes of an octave,
including sharps, to be generated. The remaining four keys causes the octave of the note to be changed, providing a complete four-octave range.

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Serial IO controller & analogue sampler

Looking for an easy-to-drive I/O controller? This unit connects to the serial port of your PC and can be programmed to switch relays, in response to voltage, resistance, temperature and digital inputs. It also includes comprehensive system timers to control the relays and you can set the system up to operate as a PLC-style controller.

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MIDNIGHT SECURITY NIGHT

Most thefts happen after midnight hours when people enter the second phase of sleep called ‘paradoxical’ sleep. Here is an energy-saving circuit that causes the thieves to abort the theft attempt by lighting up the possible sites of intrusion (such as kitchen or backyard of your house) at around 1:00 am. It automatically resets in the morning.

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Automatic Room Power Control

An ordinary automatic room power control circuit has only one light sensor. So when a person enters the room it gets one pulse and the lights come ‘on.’ When the person goes out it gets another pulse and the lights go ‘off.’ But what happens when two persons enter the room, one after the other? It gets two pulses and the lights remain in ‘off’ state. The circuit described here overcomes the above-mentioned problem. It has a small memory which enables it to automatically switch ‘on’ and switch ‘off’ the lights in a desired fashion.

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Auto Reset Over/Under Voltage Cut-Out

This over/under voltage cut-out will save your costly electrical and electronic appliances from the adverse effects of very high and very low mains voltages. 

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INFRARED TOY CAR MOTOR CONTROLLER

This add-on circuit enables remote switching on/off of battery-operated toy cars with the help of a TV/video remote control handset operating at 30–40 kHz.

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