Raspberry Pi – Getting started
What is Raspberry Pi? The Raspberry Pi is a credit-card sized computer that plugs into your TV and a keyboard. It is a capable little PC which can be used for many of the things that your desktop PC does,…
A home to software testing, electronics circuits & projects, tips and tricks and digital diary.
A home to software testing, electronics circuits & projects, tips and tricks and digital diary.
Category Electronics
LED Driver using 7805 and LM317
LED Driver using 7805 The 7805 can be converted into a content-current device by connecting a resistor as shown below. As the 12v rises from 0v, the 7805 starts to work and when the input voltage is 4v, the…
Simple doorbell Using UM66
Below is a simple circuit of doorbell using UM66. The circuit can be assembled in a general purpose PCB and enclosed in any toys. Parts C1 – 220 µF 10v VR1 – 100 k pot VR2 – 10 k pot…
LED Torch with adjustable brightness
The Led torch with adjustable brightness circuit uses LM3914 as the basis of a 10 step variable brightness current-regulated white LED . This circuit has only four components in the control and regulation circuit: R1,R2, VR1 and LM3914. Part List 1.…
Mains Powered LED Lights
All mains powered LED circuits work with 240 volt AC current. Mains powered LED – Single LED The power diode in the first diagram is designed to discharge the 220n during one half of the cycle so that the capacitor…
Audio Amplifier using LM386
Audio amplifier using LM386 is a power amplifier designed to be used in low voltage consumer applications. Typical applications are like portable AM/FM amplifier, TV sound systems. It requires minimum external parts and operate from wide range of voltage starting…
White LED on 1.5 v Supply
In this post you will find circuit on how we can light up white LED on 1.5 v supply. Heart of the circuit is the transformer winded on 2.5mm by 0.5 mm core using 0.095 mm wire. 2 White LED…
1 Watt Audio Amplifier
Audio AMPLIFIER 1 watt audio amplifier shown below is very simple and easy to make. You can use this in making pocket amplifier for your mp3 player. It can fit in small mactch box size box. Parts List for…
Flashing LED
Alternate red and green flashing LED using 9 volt battery Part list R1,R2 – 100 Ohm R3,R4 – 105 K C1,C2 – 10 μF 25 Volt T1-T2 – BC 548 D1-D5 – Red LED D6-D10 – Green LED 9 Volt Battery
Dark Sensor
Dark sensor using 2 transistor BC547 When light falls on LDR, its low resistance drives the transistor T1 into conduction. This keeps transistor T2 cut-off due to low base bias. The LED does not get power as long as ambient light…