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Inside the ZOPAN PFL-22 Frequency Counter... and what Keri found there
It's been a while... and it's new gear at Keritech time - with Nixies! This ZOPAN PFL-22 frequency counter / timer is of 1982 vintage, uses eight Z573M tubes as display devices, and all kinds of other indicators: neon lamps, incandescent bulbs and a LED. Yes, that's right: there's a single LED in a whole device. All its logic is based on TTL gates and counters, some of them higher speed (74Sxx series) and it normally goes up to 100MHz, which I'd like to upgrade to be able to use it for checking local oscillators in FM radios.
I decided to go full-on @atkelar on this frequency counter, taking it apart, cleaning the front and back, all the controls and parts... Total discombobulation - and later on, recombobulation! Maybe IC upgrade too, if I get 74Fxx fast gates. Shoving a few nanoseconds off propagation time might do the trick extending the max frequency, but I'll only try it after I get the counter working again.
0:00 Intro
0:57 A Look at the Counter
4:10 Testing
13:00 Back Panel
16:40 Getting In
26:30 So Dirty Inside...
28:07 Oven Controlled Crystal Oscillator!
32:50 Inside the OCXO
36:20 The Inner Sanctum!
40:25 Off On A Tangent: Polish Test Gear and Vintage Displays
47:00 Indicators: LED, Neon and Incandescent
51:52 Input Amplifier Module
54:20 Restoration Plan
55:00 OCXO Test
58:50 Main PCB Bottom, and A Few Words on Polish Electronic Industry
1:02:27 Afterword
Some weird A/V desync happened on the main scene, it seems - still, no critical footage lost.
Support me on my Patreon page at https://www.patreon.com/KeritechElectronics or via PayPal https://paypal.me/keritech
Instagram - https://www.instagram.com/KeriSzafir
Hackaday - https://hackaday.io/keritech
#ElectronicsCreators #Keritech #Electronics
View all episodes
It's been a while... and it's new gear at Keritech time - with Nixies! This ZOPAN PFL-22 frequency counter / timer is of 1982 vintage, uses eight Z573M tubes as display devices, and all kinds of other indicators: neon lamps, incandescent bulbs and a LED. Yes, that's right: there's a single LED in a whole device. All its logic is based on TTL gates and counters, some of them higher speed (74Sxx series) and it normally goes up to 100MHz, which I'd like to upgrade to be able to use it for checking local oscillators in FM radios.
I decided to go full-on @atkelar on this frequency counter, taking it apart, cleaning the front and back, all the controls and parts... Total discombobulation - and later on, recombobulation! Maybe IC upgrade too, if I get 74Fxx fast gates. Shoving a few nanoseconds off propagation time might do the trick extending the max frequency, but I'll only try it after I get the counter working again.
0:00 Intro
0:57 A Look at the Counter
4:10 Testing
13:00 Back Panel
16:40 Getting In
26:30 So Dirty Inside...
28:07 Oven Controlled Crystal Oscillator!
32:50 Inside the OCXO
36:20 The Inner Sanctum!
40:25 Off On A Tangent: Polish Test Gear and Vintage Displays
47:00 Indicators: LED, Neon and Incandescent
51:52 Input Amplifier Module
54:20 Restoration Plan
55:00 OCXO Test
58:50 Main PCB Bottom, and A Few Words on Polish Electronic Industry
1:02:27 Afterword
Some weird A/V desync happened on the main scene, it seems - still, no critical footage lost.
Support me on my Patreon page at https://www.patreon.com/KeritechElectronics or via PayPal https://paypal.me/keritech
Instagram - https://www.instagram.com/KeriSzafir
Hackaday - https://hackaday.io/keritech
#ElectronicsCreators #Keritech #Electronics