Lock Circuits
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This experiment may be built using only one 8-position DIP switch, but the concept is easier to understand if two switch assemblies are used. The idea is, one switch acts to hold the correct code for unlocking the lock, while the other switch serves as a.... -
This is the circuit diagram electronic door lock security key system. It means that this security system circuit is the combination of pressed key itself (not the mechanical), the output can be connected to drive the relay to open the door.... -
The following diagram is a very easy and simple electronic combination lock based on IC LS7220. Component Part List: C1 = 1uF 25V C2 = 220uF 25V R1 = 2.2K Ohm Q1 = 2N3904 / 2N2222 D1 = 1N4148 / 1N4001-1N4007 K1 = 12V SPDT Relay / Any approp....
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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.... -
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.... -
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.... -
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.... -
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.... -
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,.... -
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.... -
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.... -
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.....
A continuously working wiper in a car may prove to be a nuisance, especially when it is not...
Most battery motor speed controllers are under manual control and the operator automatically...
For maximum range, the receiver must be designed in the same manner as a radio receiver front...
At a predetermined level of declining terminal voltage, the circuit disconnects the battery from...
Just connect 22k fixed resistors across each transistor base and ground and then you may connect...
The camera and shutter control are completely self contained and can be used in any situation...
The circuit was meant to be powered by a power supply, which is why there is no transformer,...
If an oscillator of a particular frequency and mark to space ratio is required, (see Fig. 4. 4....
To the automatic transmission, there is a judder throught the box in fifth gear only and is more...
This wideband jammer simultaneously blocks all transmissions within a desired band typically by...
ASIC design choosing highly integrated, low-power, short development cycle to complete this FPGA...
As shown for the ISO103 ripple reduction circuit. Circuit at the output plus an RC high-pass...
As shown for the lighting inverter circuit principle 6 ~ 8W fluorescent. The circuit is suitable...