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Category Archives: Analog

DC millivolt source

Posted on May 5, 2015 by R-B One comment

Dilshan’s new project is a DIY millivolt source for simulating precise low-amplitude DC voltages. DC millivolt sources are often used for thermocouple simulations, DMM, ADC and analog circuit calibrations and fault findings, etc. Most of the DC millivolt circuits are based on expensive (and sometimes hard to find) operation amplifier like OP7, LT1077, etc. In this article we introduce low cost DC millivolt source based on commonly available LM308 precision operational amplifier, ICL8069 low voltage reference and 78L05 voltage regulator ICs. This millivolt source is design to obtain 200mV – 700mV DC output with 100Ω impedance. At the time of

Tutorial on Thermocouple Amplifier

Posted on April 7, 2015 by R-B Leave a comment

Bill Herd at Hackaday has posted a new video tutorial on Thermocouple Amplifier that covers the most basic instrumentation required to interface a thermocouple to a microcontroller ADC channel for reliable temperature measurements. A thermocouple consists of a junction of two wires made of different metals and are characterized by a temperature coefficient that is required to convert the thermocouple output voltage to the sensed temperature. In addition, the thermocouple also needs to be calibrated to a reference temperature point. In his short tutorial, Bill explains a practical circuit to implement precise temperature readings from a thermocouple. Different thermocouples sensors

Give your multimeter a remote display

Posted on February 3, 2015 by R-B One comment

Ken Kaarvik multimeter remote display project describes how to add a remote wireless display to specific digital multimeters (such as Fluke 17B) with a serial output using nRF24L01+ rf link. The transmitter and receiver units both uses Arduino (Trinket board). The receiving side also uses a 128×64 OLED to display the remote measurements.

Aviation band VHF receiver

Posted on December 9, 2014 by R-B Leave a comment

The aeronautical VHF band ranging from 118 to 137 MHz is the primary band used for aviation related communications. Dilshan R Jayakody’s new project is a simple radio receiver which is capable to receive audio communication between pilot and air traffic controller in the VHF aviation band. The receiver is based on Samsung’s KA22429 IC, which is a complete device for making a portable FM radio receiver. Dilshan writes, The dimension of PCB of this receiver is 70mm × 45mm and all the components except KA22429 are standard through-hole type. For the optimal results we recommended to use high gain audio power amplifier

Remote motion sensing and triggering for your DSLR

Posted on November 2, 2014 by R-B Leave a comment

We have seen Angelo making a homebrew USB condenser mic and piezoelectric power generator shoes before, both of which were kind of cool projects. Now he has come up with a remote motion sensing and triggering for a DSLR camera utilizing his favorite tool, Arduino. He proposed the applications of this project in wildlife photography, sports, and home security systems to take automatic photo shots when motion is sensed. His project has two main units. The first one is a Motion Sensing Beacon, which is located at a remote area where the motion activities are to be monitored. It consists of a

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