This project is to build a small Precision Constant Current Source Box which will give a 1mA and 10mA switched output which could be used to check the calibration of a digital multimeter. This project uses the LT3092 programmable two terminal constant current I.C.
Review and Test of a cheap DC to DC Boost Converter Module which uses the XLSEMI Integrated Circuit XL6009. Several modules are tested under different input voltage and output load conditions.
New product review of a Zener Diode Analyser designed and manufactured by Peak Electronic Design Ltd. This is a nice little analyser which supports most Zeners, Avalanche diodes and reference diodes from 0V up to 50V. More details from web link below: http://www.peakelec.co.uk/acatalog/zen50-zener-analyser.html
This is a repair of a Philips PM5127 Function Generator and a teardown of this unit. These frequency generators were manufactured in 1975. They have a frequency range of 0.01Hz to 1MHz with an output variable up to 30 volt peak to peak.
Review and teardown of a Keithley Instruments model 225 Current Source which dates back to 1976. These units are still very accurate today, with an accuracy of ±0.5%. A range switch and 3 decade switches can provide a current output from 0.1 nanoamps to 100 milliamps.
This is a teardown of a “Micronta” Digital Multimeter which was manufactured by Sinclair Radionics Ltd for Radio Shack (Tandy Corporation) in 1978. Sinclair launched the meter in 1977 and also supplied this meter directly under its own brand name with the model number PDM35 (derived from “Portable Digital Multimeter 3.5 digits). The Sinclair models […]
Building a simple small portable GPS system which will gave date and time plus Altitude, Number of Satellites detected, Longitude and Latitude. Software Code for this project can be downloaded from the link below: Project source code Parts List: GPS Module (GY-NEO6MV2 ublox) with antenna Arduino Pro Mini Module (Atmega 328 5volt 16mHz) 128×64 OLED […]
In this project I show you how to convert a 220-240v A.C. PIR Floodlight to a 12v D.C. 10 watt LED for use on a 12v battery supply. Both construction and circuit board changes are covered in detail. Circuit description and information on using the PT4115 integrated circuit to control LED current. The 10 watt […]
In this project I take you through designing, testing and building a precision voltage reference standard box giving both 10 and 5 volts to an accuracy of ±0.025% or better with out any adjustment. With the addition of a trim circuit the accuracy can be increased to ±0.0005% or better. Using standard available components it […]