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
Author: Louis Scully
Philips PM5127 Function Generator Repair & Teardown
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.
Keithley 225 Current Source Review & Teardown
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.
Sinclair Digital Multimeter PDM35 Teardown (also Micronta)
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 […]
GPS System with Arduino Mini & OLED Display
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 […]
Convert 240v AC PIR Floodlight to 12v DC LED
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 […]
Keithley 197 Digital Multimeter Teardown
Quick teardown of the Keithley 197 Auto-ranging 5½ Digit Multimeter with a comparison with the Keithley 175.
Design & Building a Precision Voltage Reference Box
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 […]
Time Electronics 404S & 404N DC Millivolt Source Teardown & Review
Here we review two Time Electronics Ltd. DC Millivolt Source calibration units. They use a precision reference zener diode, low temperature coefficient resistors and thumb switches to select a precise voltage accurate to 1 Micro Volt. They have 3 ranges and an accuracy of ± 0.05%.
Fluke 8842A Digital Multimeter Review & Teardown
A closer look at a Fluke 8842A Precision Multimeter and teardown. Manufactured in the 1990’s and had an accuracy on the D.C. ranges of up to ±0.003%. A very high quality meter.