Skip to main content

Messages

This section allows you to view all Messages made by this member. Note that you can only see Messages made in areas you currently have access to.

Messages - minkok

20
Project logs / Re: Really universal soldering controller
I don't get what exactly is unclear, but here it is - 2 gates, 4 diodes, 6 resistors, 2 capacitors. No need for transistors. And the inputs are exactly the same as on your circuit.

I just don't see the need for 4 transistors on your schematic when there are 2 free gates that do the same. I also don't quite understand what is the purpose of separate outputs for sleep and hibernation, given the fact that the controller only has one input for this.
You did not get the meaning from the begining. The two inputs are connected together only because you did not accept the idea to asign exta input for "Hybernation " signal. It is thrue that is a luck of hardware for that, but it is possible to be done in a simple way. If you think your sch. is better, just do it, we will have other option fot thouch sensing board. My sch. is here.
Do you think the two diodies difers much more from the two fets ( as a parts )? As I can see the discharging of  C in your sch. is not ok, it still integrate, may be you confused the direction of diodes? Anyway , when you finish it, just tell us.
21
Project logs / Re: Really universal soldering controller
You can always put a TVS instead of D2 or even parallel to it, although the NAND must already have such in it. The input resistance at first NAND is the same as on other variants with 4001.
I already made working sch. it is here - attached and TESTED, saved x2 nands from one IC for other tasks
If you want to help us Pease make an extra input for "Hybernation" signal - to stop the heater the time we make a hot swap.
22
Project logs / Re: Really universal soldering controller
Here's another variant. Starts swinging the output at 5Hz. 10Hz is hardly rejected, and 50Hz doesn't have a chance. No delay on putting something to holder, 0.1s delay on getting out of holder.

I would make get-out delay even half a second (larger R4). Then even 1Hz noise does not have a chance.
if your input is V2 let say for touch sensing board, what about input resistance and 2kv protection
27
Project logs / Re: Really universal soldering controller
There is always some voltage difference (and noise) between GND and tip's outer shell when the power is turnes on and off, especially on 1/2 ans 1/4 power, and no firmware can prevent this. This is exactly why I made and using optical holder sensor - no galvanic connection, no problem.
This morning  even with FX8801 I have a trouble ( no instrument ) and after its reconnecting, it started to work as expected.
Hm... , the problem arises and it is not defenetely from contact sensing nor from firmware, it is related only to my unisolder hardware. Work in progres.
This is exactly why I made and using optical holder sensor - no galvanic connection, no problem.
By the way, it sounds like " No head, no headache "
30
Project logs / Re: Really universal soldering controller
Hi Guys, Here you are small update of sensing board - Tested:
https://www.dropbox.com/s/0klve9h1ve6ejyu/Tested.3gp?dl=0
At it, multimeter is connected at output, osciloscope to the gate of BSS138. I tryed to reproduced the noise by touching the pen holder plate. If someone can confirm that, it will be helpfull. I attached the sch. and brd.
 It is tested with BC856BW ( sot323) - but the board is made for sot23 package - pay attention Please.
I got stange behavier , you can see it here:
https://www.dropbox.com/s/h4tbcyusfzco1ur/Stange%20behavier.3gp?dl=0
Don't make boards the time I cofirm it is fixed Please