555 consisting of portable electronic timing hypnosis massage
Posted on Mar 28, 2007
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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The first SUPERTEF version was using a 68HC11 microprocessor in extended mode i.e. with an...
Here they exist two regulator circuits, that use the IC L200, as regulator of voltage and...
This multimeter was designed to measure output voltage and current in a PSU, where the current...
The principle is that there is a certain parasite capacitance between coil windings, which stores...
This is a design circuit of a simple inexpensive amplitude stabilized phase shift sine wave...
Components like resistors R1 and R2, capacitors C1, C2, and C3, diodes D1 and D2, and zener ZD1...
Building your own signal generator is a rite of passage for any analog DIYer, but it`s one I took...
Part of the difficulty is that multiple caps/resistors are in the circuit in RIAA. This is based...
The first versions operated from ±15V supplies, featured bandwidths of 50 MHz, and delivered slew...
This is a write-up for a 2011 update to the 2008 lanc circuit project, lets call call phase 2....
Fluorescent tubes use far less energy than incandescent lamps and fluorescent tubes last a great...
Although it does not have the same charm as real mercury barometers with long glass tubes on...
This project generates 350V DC and stores the voltage in a large electrolytic. This voltage will...
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