The CD4093B consists of four Schmitt-trigger circuits. Each circuit functions as a 2-input NAND gate with Schmitt-trigger action on both inputs. The gate switches at different points for positive and negative-going signals. CD4093 – Quad 2-Input NAND Schmitt Trigger The difference be-tween the positive (VTa) and the negative voltage (VTb)isdefinedContinue Reading


Logisim is an educational tool for designing and simulating digital logic circuits. With its simple toolbar interface and simulation of circuits as you build them, it is simple enough to facilitate learning the most basic concepts related to logic circuits. Logisim -Simulate Digital Logic Circuits With the capacity to buildContinue Reading


This Website is intended for those intrepid individuals who, for whatever reason, find themselves looking for a less than formal approach to useful education in a number of technical fields. Play-Hookey – Online Classroom Digital logic is at the core of all digital computers, and yet it is entirely basedContinue Reading

Jens PIC and Z80 Projects PIC16C84 Programmer Z80 bootloader 8751 ROM Monitor software PIC16C84 Programmer PIC-Programmer 2 for PIC16C84 Designs for VLSI 8-transistor delay-insensitive memory cell How to make PIC’s with high clockspeed. Analog low power converterContinue Reading


Professor Lotfi Zadeh, the inventor of fuzzy logic, contends that a computer cannot solve problems as well as human experts unless it is able to think in the characteristic manner of a human being. fuzzyTECH – Fuzzy Logic and NeuroFuzzy The fuzzyPLC is programmed by an enhanced version of theContinue Reading


The ICM7217 is a four digit, presettable up/down counter with an onboard presettable register continuously compared to the counter. The ICM7217 is intended for use in hard-wired applications where thumbwheel switches are used for loading data, and simple SPDT switches are used for chip control. ICM7217 Presettable Up-Down Counter ThisContinue Reading