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Simple DIY FM Transmitter
Posted on Friday, October 1, 2021   •   Category: FM Transmitters

Simple DIY FM Transmitter

Ever wondered how come you can just simply tune in to your favorite FM Radio Channel. Moreover, ever had the curiosity of making your own FM Station on a specific frequency? Well if the answer is Yes to any of those questions then you are at the right place!. We are going to look into making small FM Transmitter for Hobby Purposes with a really basic component guide and components that are readily available off the shelf.




50W Power Amplifier With LM3886
Posted on Tuesday, August 31, 2021   •   Category: Amplifiers

50W Power Amplifier With LM3886

This is my second encounter with LM3886. I was pleased with the sound this chip produced the first time, so I decided to make another amplifier with it. The schematic is based on the schematic in the datasheet of the chip with minor changes. I removed the time delay capacitor connected to MUTE pin, because it’s better to use separate DC protection schematic which has similar functionality. I made the output inductance L1 by winding 15 turns of enameled wire around the resistor R7. The diameter of the wire must be minimum 0.4mm. The whole was wrapped with heat shrink. I used 47uF/63V non polarized capacitor for C2. It can be regular electrolytic capacitor, but it’s better to use non-polarized or bipolar.




BLF147 150W VHF Amplifier
Posted on Tuesday, June 29, 2021   •   Category: FM Transmitters

BLF147 150W VHF Amplifier

One of the very latest developments here is 150W VHF transmitter amplifier with BLF147 power transistor. Results are very impressive with well over 150W across the band with 10W input and 24 VDC supply. Over 200W is achieved at 28 VDC, and over 250W with a hot bias 4-5A quiescent. PCB is teflon glass board with printed transmission lines and porcelain caps. No external harmonic filter is needed, as the filtering is built into the matching network.




Fully Adjustable Power Supply
Posted on Wednesday, May 26, 2021   •   Category: Power Supplies

Fully Adjustable Power Supply

This circuit uses an LM317 regulator, chosen because of its built-in over-current and over-temperature protection. Its output is boosted up to 5A by the MJ2955 transistor. The output voltage is varied by adjusting VR1 potentiometer. Adjustable current limiting from 60mA to 5A is provided by op amp TL071 IC that is used as a comparator which monitors the voltage across the 0.1 Ohm current sensing resistors.




Stereo FM Transmitter With BA1404 IC
Posted on Monday, April 12, 2021   •   Category: FM Transmitters

Stereo FM Transmitter With BA1404 IC

There are many applications for an FM transmitter, particularly if it can broadcast in stereo. You can broadcast stereo signals from your CD player or any other source to an FM tuner or radio. This FM Transmitter uses a single BA1404 IC and a few other components. It broadcasts on the 88-108MHz FM band so that it can be received by any standard FM tuner or portable radio. Transmitter runs from a 5V supply and can drive a dipole antenna for improved range.




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