Search found 51 matches

by Just4Fun
Mon Jul 17, 2017 7:38 am
Forum: Off topic
Topic: Making your own pcb's.
Replies: 4
Views: 148

Re: Making your own pcb's.

About solderpaste and hot air gun... I usually use a cheap solderpaste syringe (no stencil), and often is a little "outdated" too... I found that with a "soft" PCB preheating made with a common hairdryer for a couple of minutes before apply the solderpaste, it helps a lot the adhesion to the pads an...
by Just4Fun
Fri Jul 14, 2017 11:31 am
Forum: Off topic
Topic: My first PCB at ELECROW...
Replies: 5
Views: 109

Re: My first PCB at ELECROW...

Maybe interesting to have a topic comparing PCB shops Yap, I agree... Here is my second batch of pcb's from DirtyPCBs Also made with KiCad, with a minimum track width/clearance of 6/6 mils. Total cost (incl shipping) was 25$, for a protopack of +-10 of 10x10cm pcb's (i received 12). My reason for g...
by Just4Fun
Fri Jul 14, 2017 11:18 am
Forum: Off topic
Topic: My first PCB at ELECROW...
Replies: 5
Views: 109

Re: My first PCB at ELECROW...

Pito wrote:
Fri Jul 14, 2017 9:59 am
Nice! What CPLD you work with?
Ok I see Altera on the Jtag..
Hi, I've used an EPM240T100C5N (Altera Max II CPLD). It is the cheapest CPLD with a decent numbers of elements I've found "around" (about 1$ each)...

The whole thing should cost about 5/6$ (PBC not included).
by Just4Fun
Fri Jul 14, 2017 9:24 am
Forum: Off topic
Topic: My first PCB at ELECROW...
Replies: 5
Views: 109

My first PCB at ELECROW...

Hi all, this is my first test of the Elecrow service, using the 5pcs 2-layers PCB at 4.9$ offer (max 10x10cm). https://farm5.staticflickr.com/4254/35074107154_35c8d967ac_k.jpg The PCB was designed using Kicad with a minimum track width/clearance of 7/7 mils. The total cost was 4.9$ + 6.42$ (shipment...
by Just4Fun
Wed May 24, 2017 6:48 am
Forum: Off topic
Topic: A 4$, 4ICs, Z80 homemade computer on breadboard: Z80-MBC (Mobile Breadbord Computer)
Replies: 25
Views: 1203

Re: A 4$, 4ICs, Z80 homemade computer on breadboard: Z80-MBC (Mobile Breadbord Computer)

Are you planning on selling those as a kit? Hmmm... I don't think to have the time to set up a "business" on this thing. I know that it probably has some "potential market", but I prefer spend my limited spare time to "play" with other things... :lol: I want continue a "paused" project of a "Low co...
by Just4Fun
Tue May 23, 2017 2:41 pm
Forum: Off topic
Topic: A 4$, 4ICs, Z80 homemade computer on breadboard: Z80-MBC (Mobile Breadbord Computer)
Replies: 25
Views: 1203

Re: A 4$, 4ICs, Z80 homemade computer on breadboard: Z80-MBC (Mobile Breadbord Computer)

Hi all,
as "promised" CP/M 2.2 up and running on two "floppy" emulated with two 24LC1025... :D



Here more info.

Cheers.
by Just4Fun
Sat Feb 18, 2017 1:09 pm
Forum: Postbag
Topic: Just4Fun's Postbag
Replies: 10
Views: 844

Re: Just4Fun's Postbag

Some useful "Logic Level" cheap N-MOSFETs:

100pcs BSS138 (about 200mA) @ 1.25$: HERE

100pcs OA3400 (about 5A) @ 1.80$: HERE

Cheers.
by Just4Fun
Tue Feb 14, 2017 11:12 am
Forum: Postbag
Topic: Just4Fun's Postbag
Replies: 10
Views: 844

Re: Just4Fun's Postbag

Thanks Roger,
here is an other datasheet (ED060SC4 v.2): http://essentialscrap.com/eink/ED060SC4V2.pdf

I am not sure is the LB060S01 is exactly the same.
by Just4Fun
Sun Feb 12, 2017 7:07 pm
Forum: Postbag
Topic: Just4Fun's Postbag
Replies: 10
Views: 844

Just4Fun's Postbag

Hi all, it seems I've missed a new forum section... :mrgreen: So here are my two cents: Mini thermal printer: F1.jpg payed 17$ from here: https://www.aliexpress.com/item/JP-QR203-58mm-Micro-Receipt-Thermal-Printer-RS232-TTL-USB-Panel-Compatible-with-EML203/32693670343.html but in the meanwhile selle...
by Just4Fun
Sun Dec 18, 2016 5:03 pm
Forum: Off topic
Topic: A 4$, 4ICs, Z80 homemade computer on breadboard: Z80-MBC (Mobile Breadbord Computer)
Replies: 25
Views: 1203

Re: A 4$, 4ICs, Z80 homemade computer on breadboard: Z80-MBC (Mobile Breadbord Computer)

I wonder why not use it at 20MHz and Z80 at 10MHz. A worth of a 20MHz canned oscillator (or a crystal) to add. Thanks Pito! I've done some tests and it seems that the "A" AVR variant doesn't like quartz on breadboard very much, so I decided for the internal oscillator. An "active" oscillator would ...