One 2N2222 Transistor Code Lock
Posted on Feb 7, 2014
Related Circuits
New Circuits
-
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.....
.
This Field Strength Meter has been specially designed for our FM bugs. It is capable of detecting...
This circuit is intended to control a heating system or central heating plan, keeping constant...
The circuit, is a comparator, can measure with step of 1Volt, the voltage of battery of car. The...
The circuit uses CA3290 BiMOS dual voltage comparators. Non-inverting inputs of A1 and A2 are...
In this circuit, a TU31 shunt regulator is used to sense the output voltage. The TU31 drives the...
Switching diodes are used to fire the neon lamps when negative-peak modulation hits 50. 60, and...
100 W output at 50 MHz is available from this circuit. Ul and Q2 form a T-R relay driver,...
An input rectangular signal is differentiated and short impulses are formed from its edges....
The circuit of Suzuki GSX1300 Hayabusa Charging System composed of generator, regulator/rectifier...
Figure 1 is a schematic of such an arrangement with four batteries. The diagram in Figure 2 uses...
An electronic circuit is composed of individual electronic components, such as resistors,...
Here is a schematic of a good quality AM radio receiver circuit. The heart of the circuit is...
As shown in Figure 1 hour using a LM122 timer circuit. Start of the circuit, reset and stop...
A resistor R8, capacitors Cd and thyristor V AC switch delay composition. Lamp lighting delay...
characters left: