Search found 73 matches

by david
Sat May 27, 2017 9:28 am
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2889437

Re: Hacking the HP45

@davidk for those unused input pins on L6452, may I suggest connecting them to the ground.
by david
Mon May 22, 2017 1:15 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2889437

Re: Hacking the HP45

I would encourage people to use L6452 for HP45, if you mainly want to drive the HP45 not just for fun with circuits. Although the ST's support is the worst, I'm still thankful as they do provide this chip. Look at the waveform I captured, the edges were so clear, that was with 33ohm load. I'm still ...
by david
Mon May 22, 2017 8:42 am
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2889437

Re: Hacking the HP45

My driver has been designed to do full power full speed. There is an on board programmable 4A DC-DC converter can output 5V to 13.5V. The interface was supposed to connect upto 5 printheads (with own slave version of the driver) by just one long cable, and they could be chained by short local cable....
by david
Sun May 21, 2017 6:38 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2889437

Re: Hacking the HP45

The current problem is that the driver might be too powerful. Depends on the settings, the driver can boil the printhead in just seconds, where it stops jetting but you can hear the sizzling sound in the printhead, after a bit cool down it can print again, a lot more robust than I thought. I'm pushi...
by david
Sun May 21, 2017 1:59 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2889437

Re: Hacking the HP45

It worked, very preliminary. I don't know which nozzle is ok which not. I tested with 0xaa and 0x55 sort of pattern. I'll do more test and clean up the design. A two layer PCB is so difficult to route for this board. I'll probably use a four-layer board in next version. PS those drops were so fine. ...
by david
Sun May 21, 2017 1:02 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2889437

Re: Hacking the HP45

Driver output at 12kHz ...
by david
Sun May 21, 2017 7:29 am
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2889437

Re: Hacking the HP45

Or maybe find a printer that uses L6452. I suppose ST made this chip available to everyone, you ca buy it from stores, so there must be an old printer using it! I would buy one if I could know! I see your point - printer makers may hide its code behind an 8 digit marking but since this chip is avai...
by david
Sun May 21, 2017 7:26 am
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2889437

Re: Hacking the HP45

The dry run test from the driver output also appeared to be ok. The rising and falling edge is within 0.1us and the voltage drop when I connect a 33ohm resistor is less than 0.5V @ about 10V output. After a few tuning I'll be able to connect a HP45 soon. The 8d chip is available, especially if all t...
by david
Sat May 20, 2017 7:26 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2889437

Re: Hacking the HP45

1826-4353 has only 80 pins . Original chip number is 1821-5613 an has 100 pins. I have a card from an old printer (hp 930c) with two chips (1826-4353 and 1826-4355) and I checked the 1826-4355, with 100 pins, against schematic diagram of C88555M, that seems to be exactly same of the 1821-5613 can a...
by david
Sat May 20, 2017 7:19 pm
Forum: 3DP printing
Topic: Hacking the HP45
Replies: 749
Views: 2889437

Re: Hacking the HP45

@math, thanks for your detailed reply. I'm current designing a driver board with L6452, although ST's support is crap. If I can work out how the Vboost is going to connect, I'll use this chip. The advantage is that it works under 24V or even 19V, which suites a small 3D printer better. Otherwise I'l...