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Easy Crystal Locked FM Transmitter
Posted on Tuesday, November 24, 2020   •   Category: FM Transmitters

Easy Crystal Locked FM Transmitter

The circuit presented here uses a crystal oscillator and frequency multiplier to generate a highly-stable carrier signal frequency of 96MHz. It can be used to transmit voice or music up to hundred meters. The circuit is built around 9018 transistor, 24MHz crystal, air coil and a few other basic components.




Adjustable Delay Circuit
Posted on Wednesday, November 18, 2020   •   Category: Miscellaneous

Adjustable Delay Circuit

Build an adjustable auto power On Off delay timer circuit using CD4541 timer. This electronic timer circuit is helpful when you need to power On/Off any AC Appliances after a pre-defined duration. Delay time it can be adjusted from about 2 to 120 seconds.




DIY Adjustable Bench Power Supply
Posted on Monday, October 5, 2020   •   Category: Power Supplies

DIY Adjustable Bench Power Supply

Every electronics hobbyist needs at least one bench power supply in his house for tinkering with some weekend projects. This small power supply was built with an old 19V 3A laptop charger and buck-boost converter. Output voltage is continuously adjustable from 1.25V to 33V with up to 3A current. I have been using it for 3 weeks now and have realized that I am using it more than I thought I would.




BA1404 FM Stereo Transmitter With Amplifier
Posted on Tuesday, June 2, 2020   •   Category: FM Transmitters

BA1404 FM Stereo Transmitter With Amplifier

This is a classic low-cost stereo FM transmitter that can send your signal to a FM receiver within 500 meter range. This transmitter uses the famous BA1404 all-in-one chip and operates from 5v power supply. Stereo channel separation is excellent. You can even use this as a front-end stereo RF signal generator for a large FM transmitter setup; by adding step-by-step RF amplifier. A few inch long copper wire can be soldered at the PCB to use as an antenna. The gang-condenser can be used to adjust frequency output. You can use this with your iPod or other audio source, inside your home or car on in an outdoor garden party or wherever you use.




LM350 3A Adjustable Voltage Regulator
Posted on Monday, May 4, 2020   •   Category: Power Supplies

LM350 3A Adjustable Voltage Regulator

The LM350 is a tried and true 3A adjustable voltage regulator. It accepts an input voltage up to 35V and can deliver an output voltage between 1.25 and 33V. It is rugged beyond belief. Where fairly beefy step-down converters go up in smoke, the LM350 just takes a nap. And a nap is infinitely better than a plume of smoke. LM350 can also be used to limit current though that requires a separate LM350/LM317 in series with our voltage regulator.




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