Accurate 1 kHz Square Wave Crystal Oscillator Circuit

Accurate 1 kilohertz square wave frequency generator schematic

This is a simple, accurate 1 kHz square wave crystal oscillator circuit using frequency divider IC and crystal.

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DIY simple low voltage dual power amplifier circuit TDA2822M

This is a simple low voltage stereo power amplifier circuit using single 8 pins IC. You can easily operate it using two battery cell. TDA2822M IC work within 1.8V to 15V. This can use for many applications like small battery powered radio, alarm, portable cassette player, headphone amplifier and more.

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7805 5V 1A Regulated Power Supply with Overvoltage Protection Circuit

This is the 7805 5 volts 1 ampere Regulator with Overvoltage Protection Circuit. Most of the COMS, microcontrollers and TTL ICs require a well regulated power supply.

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AC Neon lamp filament or semiconductor blown fuse indicator circuit

AC Neon lamp filament or semiconductor blown fuse indicator circuit

This simple circuit tells you have a blown fuse without removing the fuse from its holder or semiconductor fuse status. This neon lamp fuse indicator circuit makes neon lamp flash up if a fuse blows or open.

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Digital Logic Circuit Designing Simulating Software

LogicCircuit – is free, open source educational software for designing and simulating digital logic circuits.

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Automatic Gain Control PreAmplifier Circuit Diagram

The preamp circuit uses an easily obtained 741 op amp set for an internal gain about 200.

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4017 LED Knight Rider Circuit Diagram

4017 LED Knight Rider Running Light Circuit Diagram

In this  4017 Knight Rider circuit, the 555 is wired as an oscillator. It can be adjusted to give the desired speed for the display. The output of the 555 is directly connected to the input of a Johnson Counter (CD 4017).

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