Electronics > Beginners
Jellybean hobbyist general purpose transistors..
Zero999:
--- Quote from: jaromir on October 13, 2017, 04:41:04 am ---
--- Quote from: Vtile on October 12, 2017, 11:28:44 pm ---BC547B(npn) & BC557B(pnp) comes to my mind.
--- End quote ---
I tend to use BC327/337, as those have higher Ic (800mA versus 100mA), being more useful for switching loads like relays or common anode/cathode of MUX-ed displays.
--- End quote ---
The BC547 & BC557 have a higher current gain than the BC327 & BC227. I like to get the BC547C and BC557C because they have a high beta and aren't much more expensive than the B variants.
capt bullshot:
As stated, there are too many MOSFETs.
For small signal purposes up to driving LED matrices, IMO BS170 / BS250 are a good choice (I've done few hobby projects using them in the past)
For some more current / voltage: IRF540, IRF840 (these are not logic level)
For logic level: IRLZ44
These are parts that I've used in the past, were easy to obtain and quite common back then.
Vtile:
Thank you all for the information. I see what I can find with decent overall cost (product+shipment+handling+taxes). :-+
Good points that I also need to go through.
For dual JFETs the only one I do know is the 2N5909 for (serious) instrumentation. I kick myself that I didn't get two (to just see what kind of animal it is) when they still were locally available way below ebay prices. Not that I would need one, but..
The 4117 were my list just because it is what it is and it still is available in the discrete form. Unfortunately the A-subtype is not hobbyist friendly priced in any form, while MMBF4117 is. (unfortunately in SMD, but luckily SOT23 is still somewhat usable, without PCB and professional equipment.) :)
It is true about handpicking and doing Darlingtons and pairs when needed (when you have the stock where to pick!!!). I just thought if there is known decent general types (BJT and/or JFETs).
I'm personally accustomed to check the leg order as I traditionally have had that one piece of every transistor type pulled out from that random device (starting from ancient OC-series). So yeah a slight leg order variation doesn't put me (personally) down. I also have a bag full of old free soviet/VEF-riga parts including about ½kg of transistors my father did bring to me in late 90's when he traveled in the Baltic, but they are so wild and random. :D True also, if someone doesn't have the "$20 transistor tester", get one, I still wonder how I survived before.
Vtile:
--- Quote from: Hero999 on October 13, 2017, 08:32:47 am ---
--- Quote from: jaromir on October 13, 2017, 04:41:04 am ---
--- Quote from: Vtile on October 12, 2017, 11:28:44 pm ---BC547B(npn) & BC557B(pnp) comes to my mind.
--- End quote ---
I tend to use BC327/337, as those have higher Ic (800mA versus 100mA), being more useful for switching loads like relays or common anode/cathode of MUX-ed displays.
--- End quote ---
The BC547 & BC557 have a higher current gain than the BC327 & BC227. I like to get the BC547C and BC557C because they have a high beta and aren't much more expensive than the B variants.
--- End quote ---
BC547/557 is interesting as the A type have the least gain, while the C type the most. I settled in B-type in my own choice (as now), because the pricing, but let see what is the final decision.
jaromir:
BC327/337 is also binned by manufacturer by gain - see here https://snag.gy/fzlU1o.jpg taken from http://www.mouser.com/ds/2/149/BC337-193546.pdf
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