Author Topic: "Let's get down to brass tacks"  (Read 2508 times)

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Offline Victorman222

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Re: "Let's get down to brass tacks"
« Reply #50 on: October 05, 2024, 03:57:40 pm »
Here's some of the methods i used:

1. Dedicated proto boards[1, 2]: expensive, and the ones with plated through holes aren't very prototype friendly, since desoldering becomes a pain. On the other hand rugged. I like the ones where power tracks go under ICs so power connections can be made by just bending a pin. For me it's better to have a bigger board and cut out chunks that are the right size for your project using metal cutting scissors.

2. Cutting slots in FR4 laminated stock[3]. Its the method i go to for simple stuff where i can plan out the cuts in advance. I do it the way RoGeorge described with a sharp "tooth" and a utility knife. This method is smd compatible.

3. Building above a FR4 ground plane[4, 5]: this works better for more complex stuff where i can build it block by block, debugging along the way. I put ICs up in the air by connecting them with a thick ground wire, use capacitors or resistors to ground as spacers. Looks flimsy, but the project i shown fell from my table about 5 times and it still worked (survivorship bias ;) ).

4. Board with pins [6]: not as nice as the other methods but works. The one i have is plastic, but i seen some made out of FR4.

5. Board with pre cut slots [7]: better than the pins board, definitely usable. Maybe if there were power planes below and they came out at designated spots it would be nice. Also may be smd compatible.
 
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Offline RoGeorge

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Re: "Let's get down to brass tacks"
« Reply #51 on: October 05, 2024, 04:38:35 pm »
Nice close up pics!  :-+

Another way I've seen once is this method using tailor rivets made for leather or textiles, which are stapled into cardboard.  :)



You may say this won't scale up, but here he built an entire processor made out of LEDs and photo resistor, no transistors:

LLTP - Light Logic Transistorless Processor
by Dr. Cockroach

https://hackaday.io/project/172413-lltp-light-logic-transistorless-processor
https://hackaday.io/wa4jat

Original project and very creative prototyping method.
 
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Offline tggzzz

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Re: "Let's get down to brass tacks"
« Reply #52 on: October 05, 2024, 04:51:31 pm »
Agreed,  I was only making the comment as a caution to someone fresh to the technique.

I have though made it a policy not to use thin stock for the pads if it's for use in tuned circuits, a "few pF" is significant at 100Mhz for instance, not a show stopper but it has to be worked around, just as one has to with parasitic inductance.

Regards.
X

A common trick is to use 1M through-hole resistors as standoffs - one end to the ground plane, the other end is used as a solder point for the signal connections. Then you are away from the ground plane so the capacitance is insignificant and the resistor won't impact the circuit.

With a standoff, a higher value resistor,  or just "airbridged", it also reduces  DC leakage.
There are lies, damned lies, statistics - and ADC/DAC specs.
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