Posts tagged ‘74HC04’

Reverse Engineering a Wavetek OCXO Board

I bought a Wavetek OCXO board a long while ago. My original plan was to remove the onboard crystal oven to replace the broken OCXO in my HP 5350B. But since I later managed to fix the original OCXO , this board had been sitting quietly in one of my component bins collecting dust. Continue reading ‘Reverse Engineering a Wavetek OCXO Board’ »

Yet Another Semiconductor V/I Curve Tracer – I

Semiconductor curve tracers were frequently used in analog circuit designs many decades ago, at a time when discrete semiconductor devices were in dominance and ICs were scarce. While curve tracers are no longer widely used nowadays due to the ubiquity of digital circuitry and computer aided designs, they are still quite popular in the educational world and among hobbyists. In this and the next post, I will discuss some of the design considerations of a curve tracer that I built and show some real-world measurement results. Continue reading ‘Yet Another Semiconductor V/I Curve Tracer – I’ »

A DIY Vacuum Fluorescent Display Driver

In my previous post, I showed a simple vacuum fluorescent display filament driver built using a 555 timer and a custom hand-wound, center-tapped toroidal pulse transformer. And as promised in my earlier comment, I am going to show you the remainder of the VFD driving circuit here. Continue reading ‘A DIY Vacuum Fluorescent Display Driver’ »

Finicky MCP2210 Oscillator

Over the past couple of weeks, I had been busy playing with Microchip‘s MCP2210 USB to SPI converter. I was planning to create a Linux based API since Microchip only provided the Windows version. What I quickly found out though was that the oscillator circuit for MCP2210 was quite finicky, and it took me a while to find an alternative solution. Continue reading ‘Finicky MCP2210 Oscillator’ »