Usagi Electric | Restoring an HP 521A Frequency Counter: Part 1 @UsagiElectric | Uploaded February 2022 | Updated October 2024, 20 hours ago.
We’re back into vintage HP stuff baby! In the previous HP video I asked y’all what piece you wanted to see next, and the while the voting was tight, the 521A Frequency Counter won out in the end. Honestly, I’m quite happy it won because it was the one I was most excited about! There’s all sorts of digital and analog magic going on inside of the purely tube instrument, so let’s dig in deep and see if we can’t figure out what’s going on inside!
Here’s my previous episode on the HP AC4 Decade Counter:
youtu.be/WrBPVVKvWfE
If you want to support the channel please hop over to Patreon:
patreon.com/usagielectric
Also, we now have some epic shirts for sale!
my-store-11554688.creator-spring.com
Come join us on Discord and Twitter!
Discord: discord.gg/p7UsfHD
Twitter: twitter.com/UsagiElectric
Music:
Artist: Ben Prunty
Title: Love Story
benpruntymusic.com
Ben, if you see this, thank you so much for the years and years of excellent music! You’re one of my personal music heroes and to have some of your music in one of my tiny little videos is absolutely mega. Thank you so much!
Intro Music adapted from:
Artist: The Runaway Five
Title: The Shinra Shuffle
ocremix.org/remix/OCR01847
Thanks for watching!
Chapters
0:00 Intro
1:57 Cleaning, painting and recapping
4:27 What I didn’t replace yet
5:43 Theory of operation
8:20 Amplitude discriminator
10:23 Crystal controlled time-base
12:16 AC-4A decade counters
17:55 First start
19:31 There’s going to be a part 2 isn’t there?
21:05 Outro
21:58 Bunny!
We’re back into vintage HP stuff baby! In the previous HP video I asked y’all what piece you wanted to see next, and the while the voting was tight, the 521A Frequency Counter won out in the end. Honestly, I’m quite happy it won because it was the one I was most excited about! There’s all sorts of digital and analog magic going on inside of the purely tube instrument, so let’s dig in deep and see if we can’t figure out what’s going on inside!
Here’s my previous episode on the HP AC4 Decade Counter:
youtu.be/WrBPVVKvWfE
If you want to support the channel please hop over to Patreon:
patreon.com/usagielectric
Also, we now have some epic shirts for sale!
my-store-11554688.creator-spring.com
Come join us on Discord and Twitter!
Discord: discord.gg/p7UsfHD
Twitter: twitter.com/UsagiElectric
Music:
Artist: Ben Prunty
Title: Love Story
benpruntymusic.com
Ben, if you see this, thank you so much for the years and years of excellent music! You’re one of my personal music heroes and to have some of your music in one of my tiny little videos is absolutely mega. Thank you so much!
Intro Music adapted from:
Artist: The Runaway Five
Title: The Shinra Shuffle
ocremix.org/remix/OCR01847
Thanks for watching!
Chapters
0:00 Intro
1:57 Cleaning, painting and recapping
4:27 What I didn’t replace yet
5:43 Theory of operation
8:20 Amplitude discriminator
10:23 Crystal controlled time-base
12:16 AC-4A decade counters
17:55 First start
19:31 There’s going to be a part 2 isn’t there?
21:05 Outro
21:58 Bunny!
