Party intercom
Posted on Dec 23, 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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Relays are devices which allow low power circuits to switch a relatively high Current/Voltage...
An infra-red or wireless remote control has the disadvantage that the small, handy, remote...
The pitch of the tone is dependent upon the resistance under test. The tester will respond to...
This bull horn uses U1 as a driver stage and U2 as an output driver. U1 is set up for a gain of...
The circuit will generate precision triangle and square waves. The output amplitude of the...
This amplifier can be used for practically any application that requires high power, low noise,...
It works perfectly on the breadboard, where I can see the LED blinking at 2 Hz. However, when I...
The The reciprocating detector was designed by R. S. Badessa at M. I. T. The RD features a...
The material is presented in a manner suitable for a teaching tool. It seeks to enlighten and to...
The oscillator circuits presented on this page are from expired or non-maintained U. S. Patents....
The great network of telegraph wires that once enfolded the nation like a cobweb has vanished...
Is equivalent to single-pole electromechanical latching relay with electrically isolated...
Is using a dimmer HT7700A ASIC production keyed stepless dimming lights, make use SB single...
As shown is a 12V constant voltage charger. The power supply circuit with the same basic...
Circuit shown in Figure 3-164. The circuit can be manual and automatic two ways. During startup,...
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