McCAD PCB software
Posted on May 13, 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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The capacitor charges until the PNP transistor (here shown as a 2N3906, but you could also use a...
The main objective of this system is to transmit message or text through ordinary Land Line...
It is well know that pests like rats, mice etc are repelled by ultrasonic frequency in the range...
When operating, a waveguide directs energy onto a crystal detector. The diode shown is for X-band...
A 741 op amp is used with 100% ac and dc feedback to provide a typical input impedance of 1011...
A J309 Siliconix FET feeds a 2N5109 in a wideband RF amplifier configuration. A relay is used to...
The incoming ring is detected by transistor T1 and components wired around it. In absence of...
The purpose of this circuit is for research and education. If anyone knows where I can get parts...
A very loud sweeping siren type audio sound generator powered by 3v. The circuit uses a LTC1799...
The output F1 pin 17 of the PLA U17 goes "low" when the BASIC ROM is selected. The KERNAL ROM...
This is a single zone alarm - with automatic exit, entry and siren cut-off timers. It will...
A star-delta Bolt switching a starting circuit. Often used in Figure I-5 (a) of the knife;...
Electronic thermometers as shown in the circuit. RT is the thermistor, A is an integrated...
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jay Jul 8, 2008