Secure Entry Access Control – Smart Cards
I am working on an access system, multi-user code for entry to restricted areas. I designed one that uses purely hardware but its a bit complicated and bulky, though it works perfectly. Might you...
Author: delabs
Speech Recorder and Sound Syntheizer
I needed some help with available ics to build a small sound recorder able to hold about 120 seconds of audio, preferebly voice. I managed to find one that uses an ISD25xx series ic,...
Lead Acid Batteries FAQ
Some Questions, Searches about Batteries Answers Below, My Collection of Website Resources. delabs The Lead Acid Batteries are used in Automobiles and UPS – Uninterrupted Power Supplies. Battery Banks and Arrays are used in...
Ship Automation and PLC Technology
A Mail Thread from 2008, has been posted here. This is to enable students and engineers understand : The needs in in Maintenance Automation or Marine/Ship Automation. I could not take up this task...
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...
Usage of Schmitt trigger NAND Gates
I have a question about your “Long Duration Timer” circuit, del20017 found here ..Long Duration Timer Clock You have labeled U1 as a 4093. A 4093 is a NAND with schmitt trigger inputs, yet...
Dynamic Digital Tutors
Date: Wed, 30 May 2007 17:00:46 -0400 – Subject: 555 simulator Hello, I just found and had a chance to play with the 555 simulator over the internet. As I do a lot of...
Insulation Resistance Analyzer Required
Please quote for Insulation Resistance Analyzer DRT101
