crystal Op Amp Radio
Posted on Jun 11, 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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This is the circuit of a 500 watt linear amplifier, based upon a design by Frits Geerligs,...
This circuit sent out an alarm when its LDR sensor is exposed to light by sun or lamp. A 555...
A light based sensor using an LDR (Light detecting resistor) and ofcourse an Op Amp. You can use...
This 860 MHz Phase Locked Loop (PLL) oscillator circuit is for 1200 MHz transverter`s local...
Here is the circuit diagram of a simple 24W mono amplifier using IC TDA1516. The TDA1516 is an...
Need to amplify the output of the iPod`s headphone jack would not be enough to provide the chip...
Implementing tactile (haptic) feedback in consumer-electronic devices enhances the user ’s...
This controller is essentially 3 pairs of LED sensors in a 3G -bridge configuration. The driver...
Nearly all the existing designs I found used direct switching of the lights (with no software...
The inputs of the 74LS153 chip were mixed, which caused the address block decoding to fail. By...
Here is a simple circuit based on 555 IC that generates a pulsed magnetic field. You may use this...
How it works: the circuit as shown in FIG. VT1, VT2 and resistor R1 constitute a constant current...
Rice cooked rice cooker notification circuit works: When the rice cooker to work, A, B both ends...
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