Category Archives: Test and Measurement

Featured Posts

MAX1703 Single-Cell Boost Converter Circuit

When you design a circuit with only a single-cell battery, you will need boost-converter to provide enough voltage for most ...

Read More

55MHz Scope Sensitivity Amplifier

Scope sensitivity amplifier is a vital front-end signal processing for every scope instruments. The function of this circuitry is simple: ...

Read More

Two-Band Bxandall Active Tone Control

Using active circuit for tone control means that we can provide cut and boost, maintaining overall amplifying factor of original ...

Read More

Pulse Width (PWM) Controller Circuit

A LM3900 quad operational amplifier can be used to build a pulse width (PWM) controller. The LM3900 was chosen because ...

Read More

Small TV Modulator Using A Motorola MC1374

How can television modulator be small and simple like this? First, it uses integrated circuit, and the second, any TV ...

Read More

LM10 Thermocouple Current Loop Transmitter

Current loop transmitter is the term associated with sensor system that is used in industrial 4-20mA current loop technology. This transmitter contain the signal conditioning circuit for the sensor (chromel-alumel thermocouple), and a current regulator to maintain the current  loop … Continue reading

Posted in Test and Measurement | Tagged | Comments Off on LM10 Thermocouple Current Loop Transmitter

UHF Doppler Motion Detector

The UHF motion detector below operates on the Doppler radar principle. A radial signal is created by the oscillator (Q1). Some of this energy is reflected back to the generator by an object in the radiated field. The reflected signal … Continue reading

Posted in RF and Video, Test and Measurement | Tagged , , | Comments Off on UHF Doppler Motion Detector

LTC1045 TTL RS-232 Converter

A simple way to build a battery-powered RS-232 receiver  circuit is shown on the following schematic diagram. This circuit convert RS232 level to TTL level. Because the 100 KΩ resistor prevents device damage, the input voltage can be driven as much … Continue reading

Posted in Signal Processing, Test and Measurement | Tagged | Comments Off on LTC1045 TTL RS-232 Converter

FET Hydrophone Pre-Amplifier

Unwanted noise is eliminated by FET. FET also added capacitance caused by long cobias connecting hydrophone to shore station. Voltage gain is unity. Hydrophone preamp can be used with cables up to 3000 feet long. Use 1 Meg resistor between … Continue reading

Posted in Audio and Music, Test and Measurement | Tagged | Comments Off on FET Hydrophone Pre-Amplifier
« 1 2 3 4 5 6 7 8 9 10 11 12 ... 29 »