A related article on this site: True RMS-To-DC Adaptor for DVM Introduction This project came about when I needed to perform some reliability tests on some headphones according to IEC 268-7. The test requires operating the headphones at their rated input power for a number of hours using clipped pink noise, and muting the noise […]
A Noise Generator per IEC 268-1, IEC 268-5, and IEC 268-7 Read More »
Take Maxim’s MAX038 function generator chip, add some frills, and you have a pretty nice tool for the bench. Downloads: Main Circuit Schematic Power Supply Schematic You can build this with switches instead of buttons if you don’t want to use a micro controller. Here is the controller code. AVRStudio 4.x Assembler Source for AT90S1200A
MAX038-Based Sweep/Function Generator With Markers using AVR ATtiny2313 microcontroller Read More »
This is a means of testing AC mains operated circuits at variable AC voltages, and it also provides isolation to allow safe measurements of that circuit. A fused isolation transformer and a variable auto transformer connected together in a grounded, fire safe box. What more could you ask? Find updates at www.projects.cappels.org Introduction
An Isolated Adjustable Auto transformer using microcontroller Read More »
Downloads Download the AVRStudio assembly source for the program: M8DPM091109A.asm Download the AVRStudio hex file: M8DPM091109A.hex Find updates at www.projects.cappels.org Overview – A 10 bit digital panel meter for positive voltage only. – Input resistance: about 130k – Ranges: 0 to 10.20 volts and 0 to 102.3 volts. – Over range indication. This project came
A 10 Bit LED Digital Panel Meter With Auto Ranging Based On The ATMEGA8 Read More »
This is a low frequency amplifier with an adjustable transimpedance that is intended to be used to take relative measurements of a wide range of photo currents. Not having many parts, this amplifier can be put together in a short amount of time. Find updates at www.projects.cappels.org Introduction I needed to make some relative optical
Measure current vs voltage or voltage vs current over limited range with good accuracy. This was built on a phenolic board which was mounted on a plastic box. The box serves two purposes: It holds the circuit off the workbench, and it makes a nice, stable mount for the potentiometer. Find updates at www.projects.cappels.org I
A SIMPLE MANUAL CURVE TRACER using microcontroller Read More »
Calculates and displays L and C from oscillation frequency using reference components. No relays, no range switching, a minimum of controls. And it is pretty accurate too! Note: After reading this article, check out the improved, modified An Even Better LC Meter… The 2 line x 16 character LCD shows the calculated inductance and the
A Pretty Good LC Meter Based on the AVR using ATTINY2313 Microcontroller Read More »
An improvement over “A Pretty Good LC Meter.” Enhanced capacitance self calibration, accurate operation without precision components, and only one micro controller. Downloads Download or view the WINAVR main source file: lcm.c Download the complete package including the LCD library: Even-Better_LCM.zip (LCD Library provided with Peter Flurey’s permission) Download Gerd Sinning’s: LCcalc tools for Windows
An Even Better LC Meter Based on the AVR ATTINY861 Read More »
Shield for Arduino designed and based on the module GSM/GPRS SIM900 or the GSM/GPRS & GPS module SIM908, to make calls, voice and data connections via GPRS allow maximum customization and provide many configurations. With a microphone and a headset with a 3.5 mm jack (just the standard headphones for computers), you can make a voice call from
Is it possible to use DRAM with microcontroller AVR? Yes, it is possible. Jesperh has proved it. He hooked up a DRAM to a small processor (in this case an Microcontroller Atmel 8515), and handle the RAS/CAS sequencing and refresh in software. The type of DRAM is Hitatchi M5M44800, a 512k*8 DRAM!. Bigger than the
Interfacing DRAM Memory using AVR microcontroller Read More »
