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Re: Q68 netwrok port hardware

Posted: Wed May 20, 2020 3:31 pm
by FrancoisLanciault
Derek_Stewart wrote:Hi,

There needs to be a switch on the connector


There is.

Re: Q68 netwrok port hardware

Posted: Thu May 21, 2020 3:17 pm
by FrancoisLanciault
Peter wrote:That's correct in inactive state (Bit 0 = 0). When you pull the line high, it should change.


It does. When I apply 3.3V to the QLnet pin, the value becomes 57.

Let's wait for the BAT43.

Re: Q68 netwrok port hardware

Posted: Tue Jun 02, 2020 3:32 pm
by Peter
FrancoisLanciault wrote:
Peter wrote:That's correct in inactive state (Bit 0 = 0). When you pull the line high, it should change.


It does. When I apply 3.3V to the QLnet pin, the value becomes 57.

Let's wait for the BAT43.

SInce your test proved that your Q68 FPGA has not been damaged, I would not expect much from replacing the diodes. Did you check their polarity, by the way?

Re: Q68 netwrok port hardware

Posted: Wed Jun 03, 2020 8:26 pm
by FrancoisLanciault
Peter wrote:
FrancoisLanciault wrote:It does. When I apply 3.3V to the QLnet pin, the value becomes 57.

Let's wait for the BAT43.

SInce your test proved that your Q68 FPGA has not been damaged, I would not expect much from replacing the diodes. Did you check their polarity, by the way?


Peter, I used Dave's schematic as found here https://www.qlforum.co.uk/viewtopic.php?f=3&t=2881&start=20#p28425

You can see my board and thus the diode orientation here https://www.qlforum.co.uk/viewtopic.php?f=20&t=3255&start=10#p33944

François

Re: Q68 netwrok port hardware

Posted: Fri Jun 05, 2020 3:01 pm
by Derek_Stewart
Hi Francois,

Did you take the message by Dave into account with a bug in the circuit diagram you used

Dave wrote:I will be uploading a slightly modified board later.

It fixes a bug where the termination resistors are wired incorrectly (the signal is wired to ground not the tip, and the termination resistor to the tip, not ground side of the switch. I discovered the switched 3.5mm jacks I bought have a different connector order to the unswitched ones.

It also adds .4mm extra clearance from the supercap, which is used for battery back-up. While contact doesn't present an electrical problem, the cap is quite exposed and I have to allow for the unlikely event one wasn't mounted perfectly straight.

In the mean time, please do not use the above gerbers.


Never seen updated Gerber files or solution.

You should check your circuit with the file supplied by Peter, supplied here for reference.
qlnet.pdf
Q68 QL NET connections details
(118.74 KiB) Downloaded 11 times

Re: Q68 netwrok port hardware

Posted: Sat Jun 06, 2020 3:12 am
by Dave
Sorry about that. Nobody seemed interested so I dropped the project.

Re: Q68 netwrok port hardware

Posted: Sat Jun 06, 2020 1:50 pm
by Derek_Stewart
Dave wrote:Sorry about that. Nobody seemed interested so I dropped the project.

I was interested, but was waiting on your corrections.

I would say by experience in the QL world, I think everyone is interested, but some do not say or express the interest.

Looks like I will have to do this myself.

Re: Q68 netwrok port hardware

Posted: Sat Jun 06, 2020 3:28 pm
by FrancoisLanciault
Derek_Stewart wrote:Hi Francois,

Did you take the message by Dave into account with a bug in the circuit diagram you

...

You should check your circuit with the file supplied by Peter, supplied here for reference.
qlnet.pdf


My understanding was that the error was in the Gerber file, not in the schematics. I used Dave’s schematic, not the Gerber.

Also, I don’t see any differences between the schematic from Dave and the one from Peter.

If I am wrong, please let me know.