Many small electronic devices use LED displays, although a transformer based power supply is common, it increases the size and cost of the circuit and therefore, a capacitor power supply provides a small, low-cost, and easy to build alternative to a transformer based power supply. This circuit uses a capacitor dropper power supply to convert […]
LED and Lamps
Random LED Number Generator Circuit
This circuit is for simple Random LED Number Generator Circuit using IC CD4017 decade counter and IC CD4011 NAND gate; also it works on 9V power supply and the LEDs in the circuit represent the numbers. When we press the switch, one LED remains ON, because the counter runs very fast and the final LED […]
AC Lamp Flasher Circuit using SCR
This AC Lamp Flasher using an SCR operates directly from the 230V AC mains, also it offers a simple, low cost design, making it suitable for decorative lighting, warning lamps and festival lighting. The circuit uses an SCR for switching and an RC timing network to control the flashing operation; as a result, the lamp […]
Audio Controlled Mini AC Lamp Flasher Circuit using SCR
This article explains a simple and low cost Audio Controlled Mini AC Lamp Flasher Circuit using an SCR. The circuit responds to an audio signal by flashing the lamp in sync with the music; as the sound level increases, the lamp glows brighter. So it follows the audio level, for this the circuit uses SCR […]
Transistor Based Mini Emergency Light Circuit
Electricity failure is common in many areas, so we need backup light, so this Transistor Based Mini Emergency Light Circuit is simple and with low cost; also it uses few components only and it works automatically when power fails. Therefore, it is useful for homes and small offices and its easy to build even for […]
Switch Mode LED Driver Circuit using Transistors
Nowadays, LED is used everywhere, its used in display, in indicator and for decoration purpose also, but LED needs proper current, so if we connect LED direct to battery then it may get damage. So in this post we have designed a Switch Mode LED Driver Circuit using Transistors and this circuit is simple as […]