Q68 netwrok port hardware
-
- Trump Card
- Posts: 171
- Joined: Mon Aug 08, 2011 11:08 pm
Q68 netwrok port hardware
Today I decided to built the hardware needed to equip my Q68 with QL network ports. I had procured the parts many weeks ago from a local shop. However although I ask specifically for a BAT43 diode, I just realize the clerk gave me 1N5819 diodes instead. Equivalent parts ? When I look at the specs, they seem quite different!
Can someone more knowledgeable confirm if this would be acceptable ?
Thank you!
François
Can someone more knowledgeable confirm if this would be acceptable ?
Thank you!
François
- mk79
- QL Wafer Drive
- Posts: 1349
- Joined: Sun Feb 02, 2014 10:54 am
- Location: Esslingen/Germany
- Contact:
Re: Q68 netwrok port hardware
I‘m not an electronics guy, but looking at the specs I think you can safely substitute the 1N for the BAT (but not the other way round) because it has higher specs. Only downside is that it‘s a bit bigger.
-
- Font of All Knowledge
- Posts: 4034
- Joined: Mon Dec 20, 2010 11:40 am
- Location: Sunny Runcorn, Cheshire, UK
Re: Q68 netwrok port hardware
Hi,
I have built many Q68 QLNET adapters, using the BAT43 diodes, which the QLNET connection worked first time.
I can only suggest either replace the 1N5819 with the correct BAT43 diode or try the 1N5819 diode, it may work, but no guarantees.
I have built many Q68 QLNET adapters, using the BAT43 diodes, which the QLNET connection worked first time.
I can only suggest either replace the 1N5819 with the correct BAT43 diode or try the 1N5819 diode, it may work, but no guarantees.
Regards,
Derek
Derek
-
- Trump Card
- Posts: 171
- Joined: Mon Aug 08, 2011 11:08 pm
Re: Q68 netwrok port hardware
Not working is one thing, but damaging the Q68 is another. If you think there is no risk then I will try and report.Derek_Stewart wrote:Hi,
I have built many Q68 QLNET adapters, using the BAT43 diodes, which the QLNET connection worked first time.
I can only suggest either replace the 1N5819 with the correct BAT43 diode or try the 1N5819 diode, it may work, but no guarantees.
François
- mk79
- QL Wafer Drive
- Posts: 1349
- Joined: Sun Feb 02, 2014 10:54 am
- Location: Esslingen/Germany
- Contact:
Re: Q68 netwrok port hardware
Despite my caveat I‘m 99% sure it will work as a replacement, even without having seen the schematic, and 99.9% sure it won‘t damage anything
-
- Trump Card
- Posts: 171
- Joined: Mon Aug 08, 2011 11:08 pm
Re: Q68 netwrok port hardware
99.9% sure! Ok good enough for memk79 wrote:Despite my caveat I‘m 99% sure it will work as a replacement, even without having seen the schematic, and 99.9% sure it won‘t damage anything
- mk79
- QL Wafer Drive
- Posts: 1349
- Joined: Sun Feb 02, 2014 10:54 am
- Location: Esslingen/Germany
- Contact:
Re: Q68 netwrok port hardware
Checked the schematics now. If I read that correctly it‘s a poor man‘s level shifter using the diode as a voltage clamp. As the 1N has a lower forward voltage I think it‘s an even better protection for the Q68 pin than the BAT.
-
- Font of All Knowledge
- Posts: 4034
- Joined: Mon Dec 20, 2010 11:40 am
- Location: Sunny Runcorn, Cheshire, UK
Re: Q68 netwrok port hardware
Just be careful, it is all well quoting data sheets, but implementation is another thing.FrancoisLanciault wrote:99.9% sure! Ok good enough for memk79 wrote:Despite my caveat I‘m 99% sure it will work as a replacement, even without having seen the schematic, and 99.9% sure it won‘t damage anything
There should be care taken connecting the Q68 expansion port, which I did not fit a 2x12 header on the Q68 till late in Batch 2. This is because I did not think there would any extra hardware required.
How wrong, when Martyn wrote the QLNET driver, I started to fit a header on the Q68 expansion port.
Regards,
Derek
Derek
Re: Q68 netwrok port hardware
My problem with the 1N5819 is that I find no specification for the speed yet. The BAT43 is a relatively fast (5 ns) small signal schottky diode, whereas the 1N5819 is a power diode typically for rectifying purposes with larger currents. The diode should be <10 ns fast to sufficiently protect the input of the FPGA.FrancoisLanciault wrote:However although I ask specifically for a BAT43 diode, I just realize the clerk gave me 1N5819 diodes instead. Equivalent parts ?
-
- Trump Card
- Posts: 171
- Joined: Mon Aug 08, 2011 11:08 pm
Re: Q68 netwrok port hardware
Here I see 10nsPeter wrote:My problem with the 1N5819 is that I find no specification for the speed yet. The BAT43 is a relatively fast (5 ns) small signal schottky diode, whereas the 1N5819 is a power diode typically for rectifying purposes with larger currents. The diode should be <10 ns fast to sufficiently protect the input of the FPGA.FrancoisLanciault wrote:However although I ask specifically for a BAT43 diode, I just realize the clerk gave me 1N5819 diodes instead. Equivalent parts ?
https://www.digikey.com/product-detail/ ... -ND/950588
A bit too close to the acceptable speed ?
Francois