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4
votes
2answers
124 views

Is there any pattern or standard to through-hole resistor sizes?

I've long been under the impression that a quarter-watt resistor has a standard package, and a half-watt resistor has a standard package, etc. But I've recently gotten through-hole resistors which are ...
1
vote
4answers
144 views

High precision soldering of through hole components

I have a through hole component with many leads spaced closely together, see picture: I'm looking to unsolder it from the PCB and then solder it back again. Unfortunately, the leads are spaced so ...
1
vote
4answers
258 views

Holding components without bending leads when soldering upside down?

I am gaining experience in soldering components onto PCBs. I'm working through some one sided through hole PCBs and one thing that I'm having trouble with is holding components once I flip the board. ...
1
vote
1answer
65 views

Plated hole without circles on layers

I am a beginner on Eagle. I want a make a plated hole on PCB but no any pad on top or bottom layers. Or, a plated hole on PCB but bottom and top layers are electrically isolated. Another variation is ...
3
votes
2answers
129 views

Passing copper traces between two THT pins

I've been working on a small project as an extra activity for a basic digital electronics course I was taking, in which I had to design a TTL-logic based PCB, and etch it. I've been using Ultiboard 11 ...
0
votes
1answer
159 views

Do high power through hole resistors need a heat sink

I'm using the following resistor: click. To be precise, the MCKNP05SJ050KAA9 found here. From what I've been able to determine, my device is the ...
8
votes
1answer
372 views

Round female pin header vs square female pin header

What are the main differences (except for the obvious, one is round one is square) between the round pin headers and the square ones? Or differently asked: Why would someone choose round pin headers ...
2
votes
2answers
182 views

Can someone verify the hole diameter is correct?

I'm looking at this current sensor (datasheet) I'm a little confused at this notation for hole size. Pin 5 and 6 have a diameter of 0.6mm while pin 1, 2, 3, 4 have a diameter of 0.25mm ? Is that ...
8
votes
3answers
4k views

What pad hole (drill) size is appropriate for a given through-hole lead diameter?

I am making some new through-hole parts in Eagle for components that are not already in the various libraries. I've realized that the drill size needs to be a little larger than the lead diameter, but ...
3
votes
1answer
2k views

Advantage or disadvantages of SMD over Through hole design in high frequencies?

I know this is an elementary question. I know that SMD design has the advantage of smaller board size but I dont know which design works better in higher frequencies.
22
votes
2answers
1k views

How can I reverse engineer a simple through-hole board?

How can I reverse engineer a simple through-hole board? Trying to do it by eye gets confusing because it's easy to lose track of component orientation and location while flipping the board over. Maybe ...
2
votes
2answers
625 views

Drill files from Kicad for PTH and NPTH

I have a board in Kicad that uses a mixture of plated and non-plated through holes. It generates two drill files for these. However, manufacturers seem to expect only a single file. If they don't ...
3
votes
5answers
480 views

2 Layer Through Hole PCB

I am designing my very first PCB for a robotics project I am working on. The project will be using through hole components. I was not able to get all the traces to work on 1 layer, so I added a ...
20
votes
4answers
1k views

Do engineers still design for volume using discrete through-hole bipolar transistors?

As a hobbyist who likes plugging BJTs and discrete components into solderless breadboard for entertainment and education, I recognise that people like me are an insufficient market to make it ...
1
vote
1answer
196 views

PCB has strange looking pads, how do I solder them without impacting nearby surface mount components?

I've recently brought the px4fmu and px4ui boards. The px4io requires me to solder a power socket and headers onto it. However there are surface mount components very close to the holes/pads. Also ...
3
votes
4answers
5k views

How can I make a plated-through hole in Eagle?

I have mounting holes (0.125 in) at the corner of my PCB project in Eagle, made with the standard "hole" tool. However these are not electrically connected to anything. There doesn't appear to be a ...
1
vote
3answers
815 views

Breadboard/veroboard and SMT

By now, through-hole components have almost completely disappeared from consumer devices and also professional PCBs. But what is the alternative to build breadboard-veroboard for SMT technology? ...
2
votes
2answers
176 views

What does “Pins are on 0.17” centers" mean?

I'm looking at some switches (here) and the description reads: Small PC mounting slide switch features SPDT contacts and white positive action slide lever. Size about 0.56"L x 0.25"W x 0.34"H ...
13
votes
5answers
5k views

Plated Through Hole at home?

Is it possible to make PTH (Plated Thorugh Hole) at home? Can somebody explain the procedure?
7
votes
3answers
1k views

What's up with these plated through-holes / vias?

We purchased a number of stainless steel kiosk keyboards from a Chinese manufacturer a while back and have been seeing extraordinary failure rates (around 30%). Groups of keys just stop working. ...