So, if you’re looking for the the simplest and cheapest shortwave transmitter circuit, it’s here. This transmitter is very low power and very stable as well, uses a readily available 3 terminal ceramic resonator to set the frequency. Though this shortwave transmitter circuit can reach barely around 5 meters, but you can be increase the […]
Author Archives: Arnab
How to accurately measure low resistance with cheap Multimeter
We often need some low value resistors, less than 1 Ohm. Mostly as current sensing resistors in power electronics projects. You can’t measure less then 1 Ohm with cheap multimeters. So here’s a low resistance measurement method without a expensive miliOhm meter. There’s some other tricks to measure low resistance, here I’m going to use the constant […]
LM317 constant current source circuit design
A constant current source source can supply a fixed current to a load regardless of input voltage or load change. LM317 constant current source is one of the simplest design. The LM317 IC is quite useful as a constant current source, works on a wide input voltage range, from 3 V up to 40 V, […]
What is dielectric resonator oscillator and it’s application
A dielectric resonator oscillator is basically a high frequency oscillator, operates within a range of few tens of gigahertz. The main frequency determining component is piece of dielectric material, usually made of ceramic. This piece of dielectric is called dielectric resonator, usually constructed in special cylindrical shapes. The elements have a relatively larger dielectric constant, […]
HH004F LED driver circuit
HH004F is a low power integrated boost converter IC in a TO-92 package, look exactly like a small transistor. Though it’s quite a uncommon and undocumented IC, but you may find it occasionally in some LED torches. The IC is available in many different numbering and marking. I got one of them, and decided to draw […]
Free PCB design software – Ultimate list of 2018
There’s no short of free PCB design software to get your very own PCB ready. But which one should you choose ? Each of them have a fairly time consuming learning curve. So you’ve to pick one carefully, it should be worthy enough to invest some time. So, in this article you’ll get a rough […]
FM transmitter circuit using C9018 transistor
FM transmitter circuit is a quite fun project for electronics beginners, so here’s a circuit with the C9018 transistor. In a previous post I’ve wrote about a stable and simple miniature FM transmitter circuit, anyway it was a good one. This circuit uses the C9018 high frequency transistor, based on a different spin of the common […]
Stable miniature FM transmitter circuit
FM transmitter circuit projects are indeed quite popular among electronics hobbyists/students. But the frustrating part is most transmitters refuses to work at all, and secondly the internet is full of crappy transmitter circuits. Designing a stable FM transmitter circuit is rather a difficult job, many calculations are involved their. There are also some construction error and […]
Mobile charger circuit diagram, 100-220V AC
The market is flooded with cheap mobile charger circuit. Some of you may be looking for this type of charger circuit diagram and components list. These mobile chargers uses only few parts, very simple design. But there’s a drawback too, they got damaged easily. Some of my friends keeps asking how to repair mobile charger […]
TDA2003 amplifier circuit diagram 10 watt
TDA2003 is a robust automotive grade audio amplifier IC. It supports up to 28 volts of operating voltage and can withstand input voltage fluctuation of 40 volts. A TDA2003 amplifier circuit is very easy to make. It’s powerful enough to provide up to 10 watt RMS power easily. TDA2003 is manufactured by many different companies […]