Jet Engine Sound Generator Circuit using IC HT2844P is fun learning project and it makes jet engine sound using simple parts. Furthermore, it uses IC HT2844P sound chip to make real jet noise which is good for model fans, school work or DIY fun; also circuit needs 3V power and keeps under 3.3V or else circuit […]
Hobby Circuits
Electronic Game Scorer Circuit
To begin with, we call this circuit an Electronic Game Scorer Circuit because it uses a 555 timer IC, a 74LS192 counter, a 74LS247 decoder, and a 7-segment display. When player presses the button the circuit counts the score and each press increases the number on display, so it is easy to keep score in […]
Simple 0-9 Counter Circuit with 7-Segment Display
A Simple 0-9 Counter Circuit with 7-Segment Display shows numbers from 0 to 9 and serves digital counters, clocks and measuring instruments. Also, main parts of this circuit are 7490 Decade Counter IC, 7446 BCD to 7-segment Driver IC and it works with Common Anode 7-segment display with all LED positives joined. Moreover, a 5 […]
12V Battery Level Indicator Circuit using IC LM3914
The IC LM3914 based 12V Battery Level Indicator Circuit shows how much battery charge is left, also it works well with 12V battery-powered devices and helps prevent sudden power loss. IC LM3914 senses voltage and control 10 LEDs , it show in dot mode or bar mode and also it work with 3V to 25V […]
How to Build a LiPo Battery Charger Circuit
LiPo batteries are popular today because they are lightweight, store a large amount of energy and support recharging, however, we must charge them carefully and accurately. We need a special circuit to prevent overcharging because overcharging can damage a battery or cause a fire. Hence, this LiPo Battery Charger Circuit is simple to build and […]
Simple DIY Battery Charger Circuit using Center Tap Transformer
Simple DIY Battery Charger Circuit using Center Tap Transformer is a useful device, it fills power in rechargeable battery. Furthermore, this article show how to make easy DIY charger using center tap transformer which is good for charging lead acid battery; also it can charge any 12V battery and even a car battery. Circuit is […]