Universal electronic timer circuit diagram

Posted on Dec 11, 2010

Figure 1-1 The general-purpose timer once timing of 5 minutes to 18 hours; the timing cycle from 5 minutes to 20 hours; the total time of the timing and the timing to open and

Universal electronic timer circuit diagram

Click here to download the full size of the above Circuit.

close 18 hours. Controlling power of 500W or less, the circuit power consumption is less than 1W. Time base circuit NE555 and C3, W, when R1, R2 constituting the base pulse generating circuit. W can adjust the pulse period from 5 minutes to 2 hours between changes. R2 extended from the pulse period of action. R2 is the longest period without a pulse for 1 hour. CD4017 counter and D2-D10, K1-K10 delay multiplier circuit and other components. The circuit will extend a total of 10 times the pulse period. K1-K10 control multiplication factor, and the NE555 output pulse period was logarithmic plot. BG and triac control circuit constituting the AC power. BG group high level conduction, SCR is triggered conduction, controlled circuit. BG base to very low cut-off, SCR is turned off, the controlled circuit to stop working. C1, DW, D11, C2 composed of simple DC supply circuit to provide 12V DC power for the timing circuit. When a timer, K12 set to 1 at the, K1 open. NE555 pulse output 10 after, CD4017s EN is high and stop counting. Then click the AN, CD4017 counted once again, once the timing up to 18 hours. When the timing cycle, K12 put 2, CD4017 cycle count. Each time through the loop the longest 20 hours. Timing of opening and closed by a timing control K1-K10.

Leave Comment

characters left:

New Circuits

Zero consumption Anti-theft High power Code Switch for E-Bike Batteries

This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
Ultrasonic distance finder circuit

The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Simple Metal detector circuit with CD4030

Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Fully automatic watering circuit for flower pots

Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
Simple deep searching metal detector circuit

The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
Sub-Harmonic Bass Converter for Electric Guitars

The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
Echo Depth Sounding Sonar for Boats

In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
100W HiFi Audio Amplifier Circuit

This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
Plant-Pot Water Level Indicator Circuit

A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....