General > General Technical Chat
What happend to 320K resistors ?
Kleinstein:
The main use for THT parts is for test circuit on the bread board or manybe perf board and a few higher power parts. With a PCB it is much easier to use SMD parts and build to oder PCBs have become relatively cheap.
It does not take much practice to solder 0805 resistors and caps and 0603 as also not hard. One used to it one hardly wants back to THT, even on a perf board.
Especially for DAC and 1:2:...:32 resistors it is absolte normal to combine 2 resistors , as this reduces the number of unique parts. I would even consider just 2 values and us each as 2 in parallel, as a single and 2 in series. The 320 K resistor in the circuit is the least critical, so 314 K and maybe even 330 K should be good enough.
Siwastaja:
--- Quote from: Jan Audio on February 20, 2021, 03:56:06 pm ---
--- Quote from: daqq on February 20, 2021, 03:35:04 pm ---Several suggestions here solve your problem, all of which you have refused for silly reasons.
--- End quote ---
The reason is i already have those parts.
--- End quote ---
Trying to design around what you have is all fine, but you tend to run in trouble as soon as you are building more than you originally expected and run out of those "free" parts.
For this reason even though I like using my existing stock, I'm very careful when doing that so that I don't need to redesign suddenly.
Using your own stock works as long as you know the parts are either easily orderable with product lifetime left, or generic enough to have acceptable replacements.
Most components are very cheap; I just buy new components by default, and use excess stock for one-offs and prototypes where I know I'll only build that one piece.
BTW most good practices are the same regardless of being a professional or a hobbyist. For example, you want your circuit to work nevertheless. Similarly, you want to use parts that are available. And miniatyrization, often a professional product can be arbitrarily large, or a hobby project needs to be small, or vice versa.
bdunham7:
--- Quote from: Jan Audio on February 20, 2021, 04:04:25 pm ---Stockpiling obsolete parts is a serious thing in this hobby, and you can make good money also if you buy enough.
--- End quote ---
Oh I know--I recently bought 10 resistors for $5 each plus an hours drive to get them and I was quite happy to be able to acquire them. But that is for a repair scenario where there aren't good alternatives. If it was something I was making, I'd try to use parts with good availability.
Jan Audio:
$50 for 10 resistors,
you make me think those $50 ( excl. tax ) for 100 resistors are worth it.
For $50 i build a whole synthesizer.
Monkeh:
Or you could just alter your design and use series and parallel combinations of more common values to get the desired value instead of whining about how hard it all is.
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