home made ROM chip for transistor tester

[@silectronics]

I know some have been asking for a test video....I have been too busy with other things but I promise to finish this and upload the result....thanks guys

[@ndrsg3013]

Nice hobby, which I am starting at the age of 34 :D

[@aprilmeowmeow]

this was really interesting, thank you!

[@silectronics]

your welcome hope it was helpful

[@candidmoe8741]

You are a genius!

[@silectronics]

well.....I didn't expect that but ok.....lol...thank you very much......hope my video was helpful to you if your using the idea for your own project...

[@Martin-dz8qp]

cool retro circuit.

[@mcbrianmiller1264]

matrix is the mathematics or row and column. Thanks for the video.

[@norcrofury]

Thank you so much

[@Shawn_White]

Aren't there issues with wiring led's in parallel, IE the one with the lowest voltage drop turns on and the rest remain off.

[@silectronics]

LED's are wired in parallel but opposite polarity so no issues. You can connect thousands of leds in parallel . The only issue then will be total current draw especially if they all come on at the same time. Thanks

[@silectronics]

geez its been quite a long time.......my sincerest apologies for such a delay.......but i finally saw your question.......i dont know why it shows now........but its no use questioning the workings of the internet...sometimes that happens....anyway, to answer your question, no there is no problem....first of all these LED's are wired alternately to each other which means cathode to anode ad anode to cathode so only one can come on at a time depending on direction of current flow and even if you do have parallel connected LED's, it still would not be a problem as long as sufficient voltage and current is available to turn all of them on.......example, LED's require between 10 t0 20 milliamps of current on average to turn on so if you have only10 miiliamps available going to 2 parallel LEDs than the one with the least voltage drop and least current will activate and not the other because of insufficient current....but increase the current to at least 20 or higher milliamps than both will turn on..only difference might be seen in their luminosity or how brighter one is than the other but they will both come on.....thanks, hope that finally answers your question and i am truly sorry it took so long to answer you.....

[@silectronics]

yes..you are correct...it is a 3-bit output.....but it also is an internal 18 bit capacity rom......consider it like a 1,024 bit chip with only a 1 line output which would be a 1 bit output, 1 k memory chip......this is a 3 bit output 18 bit capacity rom.

[@norcrofury]

Also, would A, B, and C all contribute to what would be called a 3 bit output?

[@silectronics]

yes

[@legendgames128]

I've been trying to find out how to build a rom.

[@legendgames128]

Note that I've just started watching.

[@silectronics]

ROMS are very easy to understand.......hope my video helps you......please note I've used diodes in my prototype but ROMS can be made with other things too such as magnetic ferite cores, emmiter coupled logic using only transistors, FETS, MOSFETS, fuseable links such as used in PAL chips.......etc.....if you need some kind of memory capacity system very very specific and only certain amount of bits or bytes to eliminate wasted space then the way to go is to build it yourself like I've done.......all the best.

[@legendgames128]

@@silectronics It helped me! Thanks! Update: I ended up building a PROM in logisim and my next step is to do it irl.

[@eggmeister6641]

Not even bothering to use a breadboard.

[@norcrofury]

Could you show a test video please?

[@Crux161]

All that and you didn't even power on the chip :\ would have liked a demo for sure

[@silectronics]

sorry about that but I didn't get to finish the project at the time I made the video....you can actually view a demo from "stoneslice" of my circuit as he used my circuit to develop his own tester and he shows the units function in testing different components....thanks

[@memestopyoutubeless3157]

TA66XXX

[@silectronics]

thank you....but I enjoy it my way better.....this way I can make it do exactly what I want

[@memestopyoutubeless3157]

@@silectronics stíll enjoyng

[@Borristhebeaver-xg5eb]

100th like