Archive for category: Measurement Circuits

Solar Panel Current Meter

Measurement Circuits | By: Diagram mania

This circuit is used to measure the current from a solar panel. It has very low power loss for currents in the 0-10A range. It also works as a general purpose DC current meter. The circuit can be used on either the positive or negative side of a DC circuit. Read more original source: http://www.solorb.com/elect/solarcirc/imeter/index.html

Moisture Meter by 2N2222

Measurement Circuits | By: Diagram mania

Yesterday I tours an orchard of a friend. He consults about Moisture Meter Circuit. By this circuit uses for level moistness temple of the earth. Fine the value R2 give Meter read the value has 1mA. When the moistness in the earth is in the level that wants thus Meter will read level moistness lowland […]

Simple VU Meter form multi meter

Measurement Circuits | By: Diagram mania

Expensive stereo is general often have VU meter come to and for help show max power the stereo not too much. For radio tape general plaything has will no VU Meter. I then think to seek Multi meter use can replace. By use Range 100uA and electronics equipment the other again. It have be Potentiometer […]

4V-220V test led probe

Measurement Circuits | By: Diagram mania

Using inexpensive components, you can fit a simple probe circuit into a pencil-sized enclosure. When both LEDs are on, the probe indicates the presence of an ac voltage; either LED alone indicates the presence and polarity of a dc voltage. The diode-bridge arrangement allows one-way current source R1, R2, Q1, and Q2 to light either […]

LC Meter based on PIC16F84A

Measurement Circuits | By: Diagram mania

This is one of the most accurate and simplest LC inductance / capacitance Meters that one can find, yet one that you can easily build yourself. This LC Meter allows to measure incredibly small inductances starting from 10nH to 1000nH, 1uH to 1000uH, 1mH to 100mH and capacitance from 0.1pF up to 900nF. LC Meter’s […]

The Simplest Possible pH Meter

Measurement Circuits | By: Diagram mania

Here’s a schematic diagram for the simplest possible pH meter. Two 9-volt batteries power a high-input-impedance operational amplifier, such as a TL082. The pH probe is connected to the non-inverting input. The output voltage (V out), which is directly proportional to pH, is read with a voltmeter. The TL082 (or any other operational amplifier with […]

Wall Clock Governor Driver

Measurement Circuits | By: Diagram mania

Wall Clock Governor Drivers – These were common before the advent of quartz controlled stepping motor clocks Here is a reverse engineered diagram of this very typical circuit: Coil detail : 54.5mH with CT open air.Q1 Transistor motorola silicon TJ210 , Source: http://www.members.shaw.ca/novotill/ClockGovernorDrives/index.htm

Simple Pulse Generator Has Low Parts Count by IC MAX4232

Measurement Circuits | By: Diagram mania

IC Max4232 to try very much. I to see in web http://www.maxim-ic.com welcome to see… Simple Pulse Generator Has Low Parts Count Abstract: With a few op amps and some external components, you can build a pulse generator with variable frequency and duty cycle. The natural choice for generating a pulse of variable frequency and […]

Sawtooth wave oscillator By TL082

Measurement Circuits | By: Diagram mania

In this page, I introduce the sawtooth wave oscillator which used the operational amplifier (TL082). The composition of this circuit is the same as the triangular wave oscillator basically and is using two operational amplifiers. At the circuit diagram above, IC(1/2) is the Schmitt circuit and IC(2/2) is the integration circuit. The difference with the […]

X’tal Oscillator Frequency by 74LS04

Measurement Circuits | By: Diagram mania

This circuit may used as clock frequency for many digital circuits. I got this circuit from a microcontroller clock generator.