delabs Circuits

Showing posts with label Small-Instruments. Show all posts
Showing posts with label Small-Instruments. Show all posts

Friday, July 21, 2017

Continuity Tester

Question - i want a continuity tester circuit or get one.

mail by RB

Here are some pages that might help

Simple Component and Continuity Tester - This simple project may be used for testing components, as well as checking circuit board tracks, wires and connections for continuity (conduction). It tries to pass a small current through the item being tested and the LED will light brightly, dimly or not at all according to the resistance of the item.

POPTRONICS Continuity Tester - This is another invaluable piece of test equipment for digital work. It has been designed by us to cater for a particular application . . . servicing digital projects sent in for repair. 

Continuity Tester, Smart - A tester by Tony Van Roon. This uses a 741 opamp and works off a dual supply and hence rather complex but more accurate. This may need some design changes too.

Silicon Chip Online - A Programmable Continuity Tester - Let's face it, almost every analog and digital multimeter does have built-in capabilities for testing continuity. However, this function is somewhat limited.

It would be a good idea to buy one like this

Continuity Tester CT6101

Heavy-Duty Continuity Tester CT6101- The Continuity Tester is very easy to use and is used to test for breaks in non-energized wires or cords. Continuity has a bright 360 degree visual indicator located near the tip along with a flexible lead for ease of use.

Friday, April 15, 2016

ICL7129 AD Converter needs Triplexed LCD

I'm using the ICL7129ACPL to construct a simple 4-1/2 digit DVM. I looked over the application notes on FE LCDs on a similar post and noticed that it listed the FE0206 4-1/2 digit LCD as compatible with the ICL7129 so I went ahead and ordered one. I did not notice that the FE0206 has a single backplane listed (BP on pins 1 and 40) whereas the ICL7129 has three seperate backplanes (BP1, BP2, and BP3).

ICL7129 AD Converter needs Triplexed LCD

My question is:

can the three separate BP pins on the ICL7129 be combined somehow to accomodate the single BP pin on the FE0206 or do I need to order a different LCD? If yes, how? Thanks in advance for any help you can offer.

Mail from CC USA

You have to buy this..

Digi-Key - 153-1055-ND Varitronix - VIM-503-DP-FC-S-HV. Its part no is - VIM-503-DP-FC-S-HV from Varitronix.

Another could be Mouser Varitronix LCD Displays. Ensure you buy correct part number, It is a Triplexed (like Multiplexed) Display.


Related Resources -

ICL7129A, MAX7129 - Maxim

Low-Noise, 4 1/2 Digit, Single-Chip ADC with Multiplexed LCD Drivers

Some Features -
  • ±19,999 Count Resolution
  • 10pA Max Input Bias Current (MAX7129)
  • 3┬ÁV Peak-to-Peak Noise (ICL7129A)
  • Overrange/Underrange Outputs
  • Precise 10:1 Range Select
See Also Millivolt Circuit ICL7129

Thursday, October 22, 2015

PC Sound Card Oscilloscope

Dear DAPJ: I would like to buy a Microphone and either #1. an oscilloscope or #2. sound oscilloscope software. For hobby purposes, I would like to sample different sounds & view the various sound waves studying the amplitudes & frequencies. Do you have a product that would meet these criteria?

Thank you. Respectfully,

Mail from MH - US

No i dont sell anything. But here are a few suggestions.

OsciPrime is an Open Source Android high speed data acquisition hardware platform and Android oscilloscope application. (2015)

Simple solution for only sound - Zelscope buy only software. Test out out, buy if you like it. You need a computer.

Buy a PicoScope or if you want to build one Bitscope

Study also
delabs (2009)

Saturday, October 25, 2014

Hobby Diy Oscilloscope

Is it good as a (beginner) hobbyist to crave for an oscilloscope.  mail from EA

This scope will work from your PC Audio Card or Sound Card. You First need to build the circuit below and connect it to Line-in of Sound Card.

xoscope for Linux

xoscope is a digital oscilloscope using input from a sound card or EsounD and/or a ProbeScope/osziFOX and will soon support Bitscope hardware. Includes 8 signal displays, variable time scale, math, memory, measurements, and file save/load.

Hobby Diy Oscilloscope

Zelscope: Sound card oscilloscope and spectrum analyzer

Zelscope is a Windows software that converts your PC into a dual-trace storage oscilloscope and spectrum analyzer. It uses your computer's sound card as analog-to-digital converter, presenting a real-time waveform or spectrum of the signal.
Digital PC Oscilloscope
"Our group decided to pick the Personal Computer Oscilloscope because it sounded very interesting to approach. We also felt it would help us in understanding many aspects of hardware and software interfacing. We also wanted to do something that we felt was consumer electronic related to the current market and was interesting in working with."