Archive for category: Digital Circuit

short circuits : CD4081

Digital Circuit | By: Diagram mania

The CD4081 has four separate 2-input AND gates which you can use independently but not widely as CD4011.     AND gate Buffer The above picture use the CD4081 as AND gate buffer the output logic same as the input logic (IN=OUT)   3 input AND gate This is cascading to make 3 input AND […]

Electronics timer by CD4060

Digital Circuit | By: Diagram mania

This is an electronics timer by CMOS CD4060 which is CMOS 14 Stage Ripple-Carry Binary Counter/Divider and Oscillator. Output Qn is the nth stage of the counter, representing 2n, for example Q4 is 24??6 (1/16 of clock frequency) and Q14 is 214??6384 (1/16384 of clock frequency). Note that Q1-3 and Q11 are not available. T […]

Photo Timer Circuit Circuit

Digital Circuit | By: Diagram mania

Circuit diagram Time is set by potentiometer R2 which provides a range or 1 sec. To 100 seconds with timing capacitor C1 of 100uF. The output at pin 3 is normally low and the relay is held off. A momentary push on switch S1 energies the relay which is held closed for a time 1.1 […]

Time Delay Relay Circuit

Digital Circuit | By: Diagram mania

A time delay relay is a relay that stays on for a certain amount of time once activated. This time delay relay is made up of a simple adjustable timer circuit which controls the actual relay. The time is adjustable from 0 to about 20 seconds with the parts specified. The current capacity of the […]

24 Hour Timer Circuit

Digital Circuit | By: Diagram mania

Description: These two circuits are multi-range timers offering periods of up to 24 hours and beyond. Both are essentially the same. The main difference is that when the time runs out, Version 1 energizes the relay and Version 2 de-energizes it. The first uses less power while the timer is running; and the second uses […]

Asymmetric Timer Circuit

Digital Circuit | By: Diagram mania

Description: A timer circuit with independent mark and space periods. Circuit diagram Notes: A simple astable timer made with the 555, the mark (on) and space (off) values may be set independently. The timing chain consists of resistors Ra, Rb and capacitor Ct. The capacitor, Ct charges via Ra which is in series with the […]

5 to 30 Minute Timer Circuit

Digital Circuit | By: Diagram mania

Descriptipn: A switched timer for intervals of 5 to 30 minutes incremented in 5 minute steps. Circuit diagram Notes: Simple to build, simple to make, nothing too complicated here. However you must use the CMOS type 555 timer designated the 7555, a normal 555 timer will not work here due to the resistor values. Also […]

Periodic Timer Circuit

Digital Circuit | By: Diagram mania

Description: A switched timer with equal make and equal space periods timing adjustable from over 6 minutes to 38 minutes. Circuit diagram Notes: This timer circuit is similar to the 5 to 30 minute timer except that when switch S1 is closed, the on/off action of the circuit will continue indefinately until S1 is opened […]

Time Delay Relay II Circuit

Digital Circuit | By: Diagram mania

When activated by pressing a button, this time delay relay will activate a load after a specified amount of time. This time is adjustable to whatever you want simply by changing the value of a resistor and/or capacitor. The current capacity of the circuit is only limited by what kind of relay you decide to […]

Timed Beeper Circuit

Digital Circuit | By: Diagram mania

Beeps 7.5 seconds after a preset time Adjustable time settings: 15 sec. 30 sec. 1 min. 2 min. & others Circuit diagram Parts: R1 220R 1/4W Resistor R2 10M 1/4W Resistor R3 1M 1/4W Resistor R4 10K 1/4W Resistor R5 47K 1/4W Resistor C1 100nF 63V Polyester Capacitor C2 22µF 25V Electrolytic Capacitor D1 1N4148 […]