Archive for category: Digital Circuit

Programmable Digital Code Lock

Digital Circuit | By: Diagram mania

A programmable code lock can be used for numerous applications in which access to an article/gadget is to be restricted to a limited number of persons. Here is yet another circuit of a code lock employing mainly the CMOS ICs and thumbwheel switches (TWS) besides a few other components. It is rugged and capable of […]

Digital Step-Km Counter Circuit

Digital Circuit | By: Diagram mania

Max. range: 9.950 meters with two digits Slip it in pants’ pocket for walking and jogging Circuit diagram Parts: R1,R3 22K 1/4W Resistor R2 2M2 1/4W Resistor R4 1M 1/4W Resistor R5,R7,R8 4K7 1/4W Resistor R6 47R 1/4W Resistor R9 1K 1/4W Resistor C1 47nF 63V Polyester Capacitor C2 100nF 63V Polyester Capacitor C3 10nF […]

Simple Digital Volume Control Circuit

Digital Circuit | By: Diagram mania

This digital volume control has no pot to wear out and introduces almost no noise in the circuit. Instead, the volume is controlled by pressing UP and DOWN buttons. This simple circuit would be a great touch to any home audio project. Schematic: Parts: C1 0.1uf Ceramic Disc Capacitor U1 DS1669 Digital Pot IC (See […]

Batteries charger & PSU – ideal for digital cameras Circuit

Digital Circuit | By: Diagram mania

Circuit diagram This circuit was created for digital cameras. It’s known the digital cameras have considerable power consumption. For example my camera Minolta E223 requires approximately 800 mA. In practice a mains power supply or high capacity NiMH accumulators (batteries) can satisfy this demand. This circuit consists of two parts, charger and adapter. The transformer, […]

Digital Logic Probe by IC TTL 7414

Digital Circuit | By: Diagram mania

This circuit is quite useful for displaying the states of digital lines. The two 330R resistors may need to be changed as the circuit I generally use is using a tri-colour LED(3 legs) with common cathode. Other LED’s may need more or less current. Input Output 0 Green 1 Red Nothing No LED

Digital : CMOS Monostable by 4011

Digital Circuit | By: Diagram mania

Circuit CMOS Monostable by 4011

Super stereo digital echo by KT5211P

Digital Circuit | By: Diagram mania

This stereo digital echo project is circuits pioneering in the use of the old echo circuit before using the IC-BBD to the digital system. By using a digital echo circuit IC designed especially for the heart to work. This circuit is designed as a stereo system, to make it easy, and easy to-use applications, with […]

Analogue Pulse Counter

Digital Circuit | By: Diagram mania

Introduction Although this is a fully functional circuit, it contains several interesting bits: in detail, there’s perhaps nothing hugely original about it, but in ins overall inception is is an imaginative solution to the problems that were posed, It was designed for an application in a welding machine: there are lots of bits of machinery […]

Simple Analog to Digital Converter

Digital Circuit | By: Diagram mania

Normally analogue-to-digital con-verter (ADC) needs interfacing through a microprocessor to convert analogue data into digital format. This requires hardware and necessary software, resulting in increased complexity and hence the total cost. The circuit of A-to-D converter shown here is configured around ADC 0808, avoiding the use of a microprocessor. The ADC 0808 is an 8-bit […]

7 segment rolling display using PC

Digital Circuit | By: Diagram mania

 It is very interesting and convenient to be able to control everything while sitting at your PC terminal. Here, a simple hardware circuit and software is used to interface a 7-segment based rolling display. The printer port of a PC provides a set of points with some acting as input lines and some others as […]