Voice Recorder and Playback using ISD100A
Posted on Mar 17, 2013
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 preamplifier was designed for low resistance sources like moving coil heads (MC). The...
Flashing occurs each time the capacitor discharges through the tumed-on SCR. When the discharge...
The converter generates an output voltage which is linearly proportional to the input frequency...
4 Stage FM transmitter circuit diagram. It uses four radio frequency stages: a VHF oscillator...
This Bat Detector Circuit is authored by Chris Eve. Basic tests with a variety of salvaged...
Detection systems are a key component of any imaging system, and an understanding of their...
Intercom or Inter communication circuit is a two directional communication system. It provides a...
Introduction The MIC2290 is an internally compensated standard step- up Switching Regulator with...
How to take the triangle wave waveform and bend it into a sine wave. To help adjust its transfer...
The cost of electricity around the world has steadily been rising for over the past 40 years....
This is a very practical device and I built it so that it is a module to my Dual Channel IR...
A 10 MHz crystal is typically 4 ohms at its series resonance and 40 kiloohms at its parallell...
The excitation device for light duty synchronous motor 625kW initiated. Triggering the device...
As shown by the triangular wave circuit composed of two OP, R62 is OFFSET adjustment, R27 for...
As shown in FIG constituted by OPA340 INA321/322 output buffer circuit. INA321/322 optimum load...
Circuit shown in Figure, the circuit can achieve greater power output, just change the part of...
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