Monthly Archives: May 2009

Single Chip FM Transmitter, For Short Range Application

Posted on May 28, 2009 by Adam
small-fm-transmitter

The FM transmitter circuit here works in the broadcast band 88 to 108MHz, and can be used to broadcast audio signals for remote listening.  The output power is around -21dBm, and the circuit operates with 3V power supply. Here is … Continue reading →

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1.5V LED FLasher Using 3 Transistors

Posted on May 28, 2009 by Adam
low-voltage-led-flasher-transistor

To make LED works, you need a voltage source that is higher than the LED’s forward bias voltage, and it’s higher that 1.5V (around 2V for red LEDs). Fortunately, now you can make a LED flasher circuit that needs only … Continue reading →

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UHF Antenna Booster

Posted on May 28, 2009 by Adam
uhf-antenna-booster

Antenna Booster Circuit This antenna signal booster works for TV receiver in UHF band (400-850MHz). This antenna booster gives around 10 to 15 dB amplification.  Here is the schematic diagram of the circuit: This antenna amplifier circuit need special attention … Continue reading →

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