<< previous page 3 next page >>    .: Sound Level Indicator       This project uses an LM3915 bar-graph IC driving two sets of ten LEDs for a 30dB range. The circuit is unique because it has an additional range of 20dB provided by an automatic gain control to allow it to be very sensitive to low sound levels but it increases its range 20dB for loud sounds. Check it out!more     .: Ponyprog Circuit for AVR & PIC16F84     Build this great multi programmer that can program  almost every PICmicro and Atmel's AVR microcontroller. It is connected to the pc via serial port and uses the well known PonyProg2000 from http://www.LancOS.com more      .: Simple Servo Tester       This is a simple servo tester which will comprehensively test the capabilities of almost any modern servo. That's a must for every RC hobbyist.  It has two pushbuttons, CENTRE and SWEEP and a potentiometer which works as follows. more  .: 13.8V 20A power supply       This PSU has been especially designed for current-hungry ham radio transceivers. It delivers safely around 20Amps at 13.8V. For lower currents, a separate current limiting output, capable of 15ma up to a total of 20A has been added.more    .: 4 Watt FM Transmitter       This is a small but quite powerful FM transmitter having three RF stages incorporating an audio preamplifier for better modulation. t has an output power of 4 Watts and works off 12-18 VDC which makes it easily portable. It is the ideal project for the beginner who wishes to get started in the fascinating world of FM broadcasting and wants a good basic circuit to experiment with. more   << previous page 3 next page >>

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