complicated single side PCB layouts!

[pike]

Oh ok 8) . That is some very nice work there mate. Good Job.

 

[zachtheterrible]

While we're on this topic: Ive made a couple PCBs using the toner transfer method with what would be very nice results. The reason they are "would be" nice results is that I have to first print out my artwork on a regular piece of paper, then take that artwork and use a copying machine to print out onto photo paper. I cannot directly print onto photo paper because every time i try it with a laser printer, it always jams because the staples picture paper is not made for laser printers (its too thick). In this process of printing and then copying, the artwork gets rather jagged.

It works fine for my applications so far because I've never done SMD or anything reealy intricate.

Has anybody had this same problem? Thanx :lol:

 

[pike]

Yeh, my school librarian isn't to happy about the problem of some kid jamming the photocopier every fortnight. (That kid is me). And its an industrial type as well

 

[Pommie]

Is that a 6203 I see. I'm just starting on a motor control circuit with a L6203, a 16F819 and other bits to try and make a reasonably powerful (and cheap) servo. The hardware is now working fine and I'm just starting on the PID algorithm. If that is similar to what you have done, then I would be very interested in any pointers.

TIA

Mike.

P.S. This is what I have so far.
P.P.S. I didn't realise how bad my area looked.

 

[Exo]

It is a L6203 yes, used to control a brused DC motor on a movable satellite dish. It's just used as H-bridge to allow it to turn right or left.

It's just a test board tho, to test ways of current chopping and SC protection cause i can't find any good info about it on the net.

 

[pittuck]

Thought i would add my board, can ya guess what it is yet?

 

[pike]

You are controlling 2 motors, thruogh your computer using rs232??
But the 2n2222 transistors suggest something to do with rf??? :?

 

[Nigel Goodwin]

But the 2n2222 transistors suggest something to do with rf??? :?

Why?.

I would suggest they are being used as simple inverters or switches.

 

[pike]

They are RF type transistors, and rated to go to 300mhz, anything higher than that would probably be a mosfet. Dont know why you would use high speed transistors when a suitable cheaper transistor was available.

 

[pittuck]

just simple swiches

They were the 'cheapest' avaliable.

But also used in BEAM robotics. There is one main component u have not spied yet!

 

[Nigel Goodwin]

They are RF type transistors, and rated to go to 300mhz, anything higher than that would probably be a mosfet. Dont know why you would use high speed transistors when a suitable cheaper transistor was available.

Normal cheap silicon transistors commonly go to 300MHz, that isn't a spec for an RF transistor - just a cheap audio/switching transistor - the BC107 I commonly use is rated at 300MHz as well. As a handy byproduct, you can use them in bugs as well :lol: