# Car Voltage Gauge

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The Car Voltage Gauge is based on 3 parts. The input circuit is an Analog to Digital Converter (IC2 CA3162E). The purpose of this chip is to sample an analog voltage and convert it to a decimal value which is read by a Display/Decoder Driver (IC1 CA3161E). This chip will… Read more »

# The light meter circuit using a general diode

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This is a simple light meter circuit using normal diode as a sensor and show amount of light by a any voltmeter. The light can change the properties of many devices, example.. LDR as photo resistors can change resistance by light. Photodiode- like LDR but sensitive better than LDR, because… Read more »

# 6 ranges AC millivoltmeter circuits

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Sometimes, we need to measure very tiny AC voltage and also high frequency. We cannot use a general meter. How it works This circuit can easily measure the very tiny AC voltage and high frequency 100 Hz to 500 Khz. Use an op-amp is the input is mosfet types, so… Read more »

# Simple Wien Bridge Oscillator

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This wien bridge oscillator circuit which is normal,low distortion and can easily adjust the resonance frequency that depends on the pair of the resistors (R) and capacitors (C). Which we can calculate by the formula. F = 1/2 p RC In this circuit as Figure 1 the oscillator are based… Read more »

# Battery Charger / Power Supply 14V / 4A with MOSFET VN64GA

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As the the title, this circuit can function as a power supply or a battery charger. This  Battery Charger / Power Supply circuit has a voltage output of 14 volts and can supply current up to 4 amperes. Operational amplifier A1 CA3140 directly drives the N-Channel MOSPOWER VN64GA with the… Read more »

# Car Battery Alarm

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# Precision Peak voltage detector with a long memory time.

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If you want to check the peak voltage of the signal to change at any time. Measuring with a multimeter will not do it. We recommend this circuit. It may help you. We use this circuit The op-amp IC number CA3140 is the main equipment, acts as a voltage sensor… Read more »

# Variable Regulator 0-30V 5A by LM723,CA3140,2N3055

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This is circuit Variable Regulator power supply,Output voltage 0-30V and Current 5A max. Use IC LM723 is a voltage regulator designed primarily for series regulator applications. By itself, it will supply output currents up to 150 mA I so use Transistor 2N3055 X 2 for Booster current to 5A. IC… Read more »

# Precision Peak voltage detector with a long memory time.

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If you want to check the peak voltage of the signal to change at any time. Measuring with a multimeter will not do it. We recommend this circuit. It may help you. We use this circuit The op-amp IC number CA3140 is the main equipment, acts as a voltage sensor… Read more »

# Precision Peak voltage detector with a long memory time.

Schematic Diagrams      Comments Off on Precision Peak voltage detector with a long memory time.

If you want to check the peak voltage of the signal to change at any time. Measuring with a multimeter will not do it. We recommend this circuit. It may help you. We use this circuit The op-amp IC number CA3140 is the main equipment, acts as a voltage sensor… Read more »