Welcome to EZ260! This site is HEAVILY under construction an I’m just getting it set up. This site will have complete projects that I have done including schematics and a gallery of images showing what I have done. Feel free to comment and ask questions about anything of interest.
The other posts show the bits and logic schematics for relay implementation of typical gate level logic. This is the main schematic of the BCD decoder. It does have a bug in that the circuit that controls all of the output relays (EN’) will not work. Due to not thinking about other relay’s giving the […]
Been a while since I posted on this subject. I have had the PCB fabricated and assembled one BCD controller. It tool a long time to solder in all the parts, but eventually it got built. After some initial testing of the PCB I found that I had messed up ONE circuit, the one […]
7 Segment decoder full truth table. Note that RBI’ segment decoders are exactly the same except in the A=B=C=D=0 condition Here is my original truth table for the encoder. It features 7 segmenmt decoding of a BCD input from 0-9. It also features Ripple Blanking input and output much like the standard TTL Decoders of […]
Here is the start of the 7 Segment BCD decoder logic. The idea is to make a generic board that can decode BCD data and display like a LED Digit might. This is similar to the 7447 (or many variants). This post will show the general Relay based logic that I will be using. AND, […]
Ok, this has nothing to do with Tube audio, but I don’t have any other place that might be a good spot to put this project. Years ago at Disneyland they had a hall sponsored by the Bell System. It featured 360 Vision where you could watch a movie with a 360 degree screen. They […]
Well even though I have not yet finished the last tube amplifier I felt compelled to finish a small project that was on the drawing board for a while. The EZ215. This is a stereo amplifier with the expected output of 2 channels at 15 watts each. The amplifier is based a bit on the […]
This was my first real tube from scratch project. This was based on the Grommes EZ260A amplifier but done EZ style, that is done with a PCB for ‘EZ’ assembly. This is a great sounding amplifier and was a fun project.
Here is a 6SL7 and 6V6 ‘Mini-Monoblock’ amplifier. This puts out close to 10 watts and sounds awesome. I currently use this on a daily basis for my computers sound system.
The EZLoad Project is a versatile high power dummy load for testing high power audio amplifiers. It’s a simple and useful project!