low cost capacitance meter
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Blanket internal measurement circuit disconnection
The internal disconnection circuit for a blanket operates on the principle of induction. It includes a wire approximately 2 cm in length that senses the proximity of a charged mains power source. When the sensing wire is close to the...
Cool small Circuits
The QT113 is a capacitance touch sensor that does not require AC line voltage to operate. Instead, it detects changes in capacitance caused by the proximity of a user’s body. A sensor plate measuring 2 inches square can sense a...
turret diy
For maximum mini-security, this RC Tupperware Turret delivers a formidable deterrent against food theft. While it lacks motion sensors, potential food thieves will think twice before attempting to swipe baked goods. This 11-hour project, designed by Chris of PyroElectro, emphasizes...
Digital Capacitance Meter
This is a simple capacitance meter which can measure capacitance value easy. There are some measurement methods for capacitance, at one time the capacitance was measured with a impedance bridge or a dip meter. Recently typical capacitance meters can measure...
Microfarad Counter
This circuit measures capacitance by the time it takes for an unknown capacitor to reach 6.32 V (which is 63% of 10 V or one time constant, 1RC) when charged through resistor R. The LED, used as a timebase, is...
Capacitance switched light
The battery-powered light activates with ease, remaining illuminated for a few seconds before automatically shutting off. The circuit is engaged when a finger bridges the gap between two metal strips, approximately 1/16 inch apart. Sufficient current flows through the finger...
Capacitance meter
The output voltage is proportional to the capacitance connected to pin 2 of the charge pump. The meter operates over a capacitance range of 0.1 to 0 µF with a set resistance of 111 kΩ. Within this capacitance range, the...
5 mA S METER
The circuit designed for a 5 mA meter movement utilizes a two-stage voltage amplifier comprising transistors Q1 and Q2. An emitter-follower output stage, represented by transistor Q3, functions as an impedance-matching stage. The audio frequency (AF) input for an S-9...
Glue stck torch
This project, developed around 2005, involves constructing a torch using a glue stick, which conveniently accommodates an AA battery within its plastic casing. To create a functional battery holder, contacts for both the positive and negative connections are necessary. The...