FingerPrint Security circuit
Posted on Nov 8, 2012
New Circuits
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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.....
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Mains frequency is pretty stable and it is unlikely that you have to measure it but if you have...
The lamps are usually used as ballast or electronic ballast inverter. Here it is used to reduce...
This revision reduced the signal level and treble response in the preamp for a smoother sound...
This control, with zero-voltage load switching, uses a CA3130 BiMOS op amp and a CA3079...
An Apex PB50 Booster Amplifier, plus an IC op amp, can be used in a high-voltage op amp that...
Hmmm, if it is resistive, AC is equivalent to pulsed DC and the sensor is degraded in any case...
A solar charger circuit is used to charge lead acid batteries or Ni-Cd with solar power. Circuit...
It consists in 555 feet, respectively, of 1, 2-cited two-pin, using two needles with a high water...
This super-simple dimmer consists of only two components, and it can easily be built into a mains...
The circuit of active shortwave antenna presented here boosts weak shortwave signals so that...
Software such as that available on PGM-Fi. org and from Hondata make use of the Honda ECU`s...
If you want to drill a hole in the wall then you must be sure that there`s no electrical wiring....
The system consists of a CD player, amplifier, speakers, power supply, headphones. Mitsumi CD...
As shown in Figure 567 FM demodulation circuit. The figure, the FM signal from the input pin 3,...
Condenser microphone pickup signal broken by Iq. amplified and sent as a comparator HJ of lC.., -...
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