| Products > Test Equipment |
| Cheap Fast Rise Time Oscillator |
| << < (4/7) > >> |
| jonpaul:
Bravo for the DIY Pulser. Please compare to Leo Bodnar 40ps pulser, BNC and 30 pS SMA versions we use a 20 db wideband attenuator to reduce abberation due to VSWR. Besides digital scopes, a 500 MHz or 1 ghz CRT analog scope photo is useful We use Tektronix scope 7904, 7104 mainframe with 7A29 and 7B10 plug-ins. Bon Soirée Jon |
| BillyO:
--- Quote from: jonpaul on February 03, 2023, 09:59:03 pm ---Bravo for the DIY Pulser. Please compare to Leo Bodnar 40ps pulser, BNC and 30 pS SMA versions we use a 20 db wideband attenuator to reduce abberation due to VSWR. Besides digital scopes, a 500 MHz or 1 ghz CRT analog scope photo is useful We use Tektronix scope 7904, 7104 mainframe with 7A29 and 7B10 plug-ins. Bon Soirée Jon --- End quote --- Thanks! I'd love a 7104. There is actually one for sale for $800 CDN about 2 hours away from me right now with options 02 & 03 and 7A19, 7B92 and 7B15 plug ins. A nice starter kit! (I must stay strong!) |
| Bud:
--- Quote from: BillyO on February 03, 2023, 07:41:55 pm ---Yeah, the logo on the 74AC14 looks a little sloppy. I bought a large batch of IC's from Digi Key back in 2010. These, I think, were part of the batch. I don't recall getting any others, but then 13 years is a long time. --- End quote --- If you still have the Digikey bag they came in, the manufacturer name should be there. |
| magic:
--- Quote from: BillyO on February 03, 2023, 07:41:55 pm ---However, on my scope with a measured risetime of 660 ps, this version did 1.27 ns. Taking the scope RT in account that's a risetime of about 1.09ns! Not too bad. Yeah, but I'd not use a $5 oscillator to tweak my scope's front end. :-DD --- End quote --- This version looks more "ringy" than the first one, though. Nevertheless, it's still very good performance for DIP14 package. Maybe it's the Chinese chip being better than original AC logic. One pattern I have seen in knockoff ICs is that they are often die shrinks on more advanced processes; apparently it saves them money somehow. --- Quote from: Bud on February 03, 2023, 10:50:58 pm --- --- Quote from: BillyO on February 03, 2023, 07:41:55 pm ---Yeah, the logo on the 74AC14 looks a little sloppy. I bought a large batch of IC's from Digi Key back in 2010. These, I think, were part of the batch. I don't recall getting any others, but then 13 years is a long time. --- End quote --- If you still have the Digikey bag they came in, the manufacturer name should be there. --- End quote --- My question about manufacturer was absolutely rhetorical. There is no Western manufacturer with this logo and it isn't TI logo either. It's a vaguely TI-like blob intended to be different enough from TI that it's hard to prove trademark infringement. Common practice in China. There is a new thread with some fake jellybean IC every other months here. This chip probably (hopefully) didn't come from DigiKey, and 13 years is a lot of time indeed ;) |
| Bud:
Actually the logo looks familiar, but can't remember who it was. Given the long time when it was purchased, they may no longer be in business. And 13 years ago counterfeit chips were much less of a problem, i would not think Digikey had a reason to source such chips back then. |
| Navigation |
| Message Index |
| Next page |
| Previous page |