I am thinking of an opamp amplifier where I could change its gain by changing resistors.
Using large SMD resistors, is there fasteners like small fuse holders to hold such resistors.
Do you see solutions that would achieve reliable contacts.
I do not want a pot, because I need fixed gains that are extremely stable, looking for no gain drift.
Using large SMD resistors, is there fasteners like small fuse holders to hold such resistors.
Do you see solutions that would achieve reliable contacts.
I do not want a pot, because I need fixed gains that are extremely stable, looking for no gain drift.
For leaded components, Mill-Max makes a wide range of single pin sockets.
https://www.alliedelec.com/m/d/c6c6fbe723d3913f2b8bfbf3808cebdf.pdf
There are (expensive) sockets for smt transistors, but haven't seen any for resistors.
I would solder smt resistors on the pcb, and use jumpers on headers to select different values.
The "leads" on the smt parts are not intended for a reliable mechanical connection, just soldering.
https://s3.amazonaws.com/catalogspreads-pdf/PAGE128-129 .100 JUMPER.pdf
https://www.alliedelec.com/m/d/c6c6fbe723d3913f2b8bfbf3808cebdf.pdf
There are (expensive) sockets for smt transistors, but haven't seen any for resistors.
I would solder smt resistors on the pcb, and use jumpers on headers to select different values.
The "leads" on the smt parts are not intended for a reliable mechanical connection, just soldering.
https://s3.amazonaws.com/catalogspreads-pdf/PAGE128-129 .100 JUMPER.pdf
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Mill-Max products are nice.
I use tulip pin sockets that come as 14 or 16 single pins on a dummy that you remove once it is soldered. This gives a 14 or 16 pins IC socket, without any plastic. I like those very much, but do not have much left. Where can I source these ?
Tulip pins is a good solution to hold thru hole resistors, I think.
I use tulip pin sockets that come as 14 or 16 single pins on a dummy that you remove once it is soldered. This gives a 14 or 16 pins IC socket, without any plastic. I like those very much, but do not have much left. Where can I source these ?
Tulip pins is a good solution to hold thru hole resistors, I think.
I've seen those for automatic insertion, but not in small quantities.
Mill-Max has some sockets that are large enough for smaller TH resistors.
Mill-Max has some sockets that are large enough for smaller TH resistors.
+1 on the DIP switch suggestion.
And since they are independent and you can activate more than one at any moment, you can not only have the basic resistor values but their combinations.
And since they are independent and you can activate more than one at any moment, you can not only have the basic resistor values but their combinations.
I have DIP switches and jumpers but I rather avoid these because I want an ultimate no noise pick up and thermal drift.
This is for a design where I aim at an ultimate gain stability to 0.01 dB resolution.
This will go to gain calibration with a MDAC in the gain chain. ( I am not sure of the fixed gain best value.)
So I need a layout as neat as possible.
I could use SMD resistors on large pads and change resistors by soldering. How many changes the PCB could stand ? What grade of PCB and layout would be wise ? May be low temp solder ?
This is for a design where I aim at an ultimate gain stability to 0.01 dB resolution.
This will go to gain calibration with a MDAC in the gain chain. ( I am not sure of the fixed gain best value.)
So I need a layout as neat as possible.
I could use SMD resistors on large pads and change resistors by soldering. How many changes the PCB could stand ? What grade of PCB and layout would be wise ? May be low temp solder ?
