Electronics > Beginners
Recommended eBay stores for Jellybean electronic components (2n2222, 2n3904, etc
bd139:
--- Quote from: Paul Ed on February 02, 2020, 03:22:30 pm ---Nice! Tayda Electronics do look good - but can you share a link to the "Good jelly bean semiconductor kit" please?
I've browsed pretty much every section - and can't seem to find any such bumdle on offer - what did I mess?
Also, the "don't bother with xxx" comments are well made and appreciated, thank you!
As my education, training, and initial professional electronics took place 30-40 years ago, have recently returned I'm still updating the normal components to use, such as MJE3055 instead instead of the ancient 2N3055 - I was actually very pleasantly surprised to recognise so many of the items in use (7400 series, 4000 series, 2N2222 and so on) from my day, so a few chnages are easy enough to accomodate.
Do please feel free to suggest any other such chnages as you think of them, I'll be very grateful for such ideas.
Especially if you can show me the Good jelly bean semiconductor kit URL I missed, I do indeed intend to place a jellybeans items order soon-ish with Tayda - and will indeed keep RS, Farnell et. al in reserve for fill-in orders too, thanks for the advice.
--- End quote ---
It's probably better to build your own jellybean kit. Ready made kits are somewhat expensive or junk from what I can see. A fine example of expensive: https://www.bitsbox.co.uk/index.php?main_page=product_info&cPath=272_275&products_id=2007 . The selection is "ok" but the quantities aren't.
My own jellybean semiconductors are:
1. general purpose NPN .... 2N3904.
2. general purpose PNP .... 2N3906.
3. medium power NPN .... BD139 (best transistor ever :-DD)
4. high power NPN .... MJE3055
5. Switching MOSFET .... IRF510
6. general purpose JFET .... J310.
That's about it.
Paul Ed:
@bd139 - very fast reply, thank you!
--- Quote from: bd139 on February 02, 2020, 03:42:07 pm ---
--- Quote from: Paul Ed on February 02, 2020, 03:22:30 pm ---Nice! Tayda Electronics do look good - but can you share a link to the "Good jelly bean semiconductor kit" please?
....
--- End quote ---
It's probably better to build your own jellybean kit. Ready made kits are somewhat expensive or junk from what I can see. A fine example of expensive: https://www.bitsbox.co.uk/index.php?main_page=product_info&cPath=272_275&products_id=2007 . The selection is "ok" but the quantities aren't.
My own jellybean semiconductors are:
1. general purpose NPN .... 2N3904.
2. general purpose PNP .... 2N3906.
3. medium power NPN .... BD139 (best transistor ever :-DD)
4. high power NPN .... MJE3055
5. Switching MOSFET .... IRF510
6. general purpose JFET .... J310.
That's about it.
--- End quote ---
Ah! That makes perfect sense now. I didn't understand what you meant, and yes the BD139 has served me well (with a BD140) in an audio amplifier before now, I have more experience with RF in general although built a MoSFET audio amp back in the day (when MoSFETs were fairly new) that my uncle still uses, with his home-built transmission line (huge!) speakers, which do sound great even now.
Thanks for the suggested jellybeans, am making a list ;)
bd139:
That sounds cool. It's on my bucket list to build an amp. Haven't got there yet. One day. I was going to try and build a JLH class A unit (also a space heater!)
I mostly do RF stuff but at HF frequencies (usually 7MHz/40M). Same jelly bean parts I mentioned there as well. It's good when your entire 40W PA MOSFETS cost £1 a pair when you run them into a mismatch :-DD
Paul Ed:
@bd139
--- Quote from: bd139 on February 02, 2020, 05:15:08 pm ---That sounds cool. It's on my bucket list to build an amp. Haven't got there yet. One day. I was going to try and build a JLH class A unit (also a space heater!)
I mostly do RF stuff but at HF frequencies (usually 7MHz/40M). Same jelly bean parts I mentioned there as well. It's good when your entire 40W PA MOSFETS cost £1 a pair when you run them into a mismatch :-DD
--- End quote ---
When I was younger I did a lot of building, was both cheaper and a great way to gain experience - and at the time I had access to really good oscilloscopes, spectrum analysers and so on too, which helped when it didn't work first time.
The "£1 a pair" comments reminds me that in real terms electronics is cheaper now, but sadly offset by most things being even cheaper to buy ready-made (Chinese?) at least at the module level. Something I'm having to come to terms with when selecting projects.
7MHz/40M - does this mean you have a callsign?
I just noted in the recent RadCom that I need to log on somewhen to re-activate my own callsign or somesuch - which I've not done since they changed to online licences (oops!) in place of good ol' paper. As you may have guessed not been on-air for (cough) a few years - but plan to "sometime" if I can refresh my CW too.
bd139:
Good thing is you can get that decent equipment for virtually nothing now :)
I tend to avoid ready made modules where possible. It takes the fun out of it. There are a few good kits floating around though which have some nostalgic value. But yes you have to pay through the nose for that experience sometimes. Built an Elecraft K2 transceiver last year which is the “last proper kit” if you ask me and it burned the wallet pretty bad.
I do indeed have an callsign. Not listing it here though as it makes me a little too easy to identify :). Ofcom license management is all automated now but not sure how you have to deal with it. When I got my full license a couple of years back (I’m a comparative newbie) the basic thing was to create an account with Ofcom, enter certificate number and then choose a callsign. I think the process is probably similar.
CW only here. I’m no good at rag chewing on air and the band conditions are terrible at the moment.
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