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|9th October 2011, 08:55 PM||#1|
Join Date: Oct 2008
SS amp design component starter kit
Just starting to play with SS amp design and need to buy components I will need. I thought I would find an old thread on this but couldnt, if someone knows of one please diract me to it.
Last week I asked for a list of BJTs to start with and got this:
Now I move onto the rest of the components.
Semis (other than BJTs): diodes (LEDs, bridges, fast recovery, zeners )
Resistors: small wattage Metal film, power, pots.
Capacitors: Electrolytics: power, bypass, other large values
Other types: for more critical (less distortion) applications
Inductors: hope I dont need many so will deal with these when I need to.
More specific questions. What i need to come up with is a list of values for each. eg. power caps, should i buy 4 30,000uf 100v or 12 10,000uf 50v (same money, more flexibility) 0r 2 30,000uf 100v and 6 10,000uf 50v. Or should I buy the largest brdge rectifier wthin reason and be done with it?
Just starting and my heads starting to spin. The possibilities are endless so I ask for the advice of the experianced SS (not the Nazis) experimenter. Any advice is appreciated.
Dont want to break the bank so trying to get away with the minimum for starters.
Last edited by cbdb; 9th October 2011 at 08:57 PM.
|9th October 2011, 10:54 PM||#2|
Join Date: Nov 2008
Why bother buying anything until you need it. That is how I ended up with $10k of useless parts. I live in Vancouver too, so, if you have a truck....
Design your circuit and buy the parts as needed. Lee's and Main on Main, Interior, Active and RMO on Boundary, RP in Burnaby and Pacific Semi in North Van and many other places! E
|10th October 2011, 09:47 PM||#3|
Join Date: Oct 2008
Im talking about cheaper components like 1/4 watt resistors signal diodes and small caps. I don't want to have to run to the store every time I want to try a different value, or want to add a small current mirror etc. If I can get away with spending under a $100 for most of the small components I would be happy.
|10th October 2011, 11:00 PM||#4|
Join Date: Oct 2011
Location: Tokyo, Japan
Well, I started out some 10 years ago with the same idea, and bought a lot of stock components, and they do serve me well from time to time. At the time I was really focussing on building audio projects (pre-amp, amps, tone control) as provided in the books of Douglas Self and Randy Slone, and I went through most schematics to list which default components are used.
I also partly agree with mickeymoose: in the end I still have make individual orders.
Nowadays I continuously scan ebay for surplus offers (in europe and usa only), and I did very good bargains !
Anyway, hereby a first overview what I have bought over the years in bulk:
Resistors: 1/4W, metal film, 1%, prime brand !
min. 50 pcs each:
1k0 (2x 50pcs)
Resistors: 5W, non inductive, 5% (emittor resistors for output stages)
20 pcs each
Transistors, minimum 100 each for matching, all prime brands (TI, national, motorola, nec, toshiba, etc)
2SD669A (real audio classic)
2SB649A (real audio classic)
2N5401 (lucky surplus score recently: 1000 pcs)
2N5551 (lucky surplus score recently: 500 pcs)
2SC2240 (real audio classic)
2SA970 (real audio classic)
- min. 10 pcs of fixed voltages: 5V, 9V, 12V, 15V, 18V, negative and positive of course (78xx and 79xx)
- min. 10 pcs of variable voltages, negative and positive: LM317T/LM337T
100 pcs 1N4148 (the most used general purpose diode)
50 pcs 1N4001
50 pcs 1N5060
there are some more, got to look it up
Zener diodes.... too specific, perhaps some 3.2V and 3.9V at 500mW
2, 3 and 4 pin screw terminals (PCB soldered), around 10 each, should buy more !!
5 single strips (tulip type, gold plated)
20 pcs 8 pin
Caps, oof, too specific, I like to select type, brand, model and voltage rating for each one individually. Nevertheless, a couple of caps are almost default, notably the power rail decouple caps, power supply bypass caps, transformer bypass caps, and finally the mains filter caps.
25 pcs MKP10 0.01uF /630V (should buy more)
25 pcs MKS4 0.047uF / 630V
100 pcs MKS4 0.1uF / 100V (very default cap!)
10 pcs MKS4 0.1uF / 630V
25 pcs MKS4 0.22uF / 250V (should buy more)
mains filter caps:
10 pcs MP3-X2 0.22uF / 250 VAC
10 pcs MP3-X2 0.1uF / 250 VAC
NP0/C0G multilayer ceramic (prime brand only !), 10 pcs each minimum, mostly rated 50V:
Tantalum, for me limited use, notably for IC/OpAmp power supply decoupling (directly next to IC)
20 pcs each, rated 35V,
4.7 uF (the most frequent one used for IC/OpAmp power supply decoupling)
Default, general purpose, electrolytics.... ? Oh well, Panasonic FC, 10~20 pcs each, take 35V or 50V minimum: 1/2.2/4.7/10/22/47/100/220/470/1000/2200/4700 uF
pots (the small PCB operated ones), Bourns and other prime brands, single turn, and multi turn, 10 pcs each.
This is just a quick list, much more could be listed as standard stock to have....
Now, if you still have money left, then we can continue tomorrow, I gotta go to bed now.
Last edited by AmpliFire; 10th October 2011 at 11:21 PM.
|11th October 2011, 03:00 AM||#5|
Join Date: Apr 2010
If new suppliers such as Digikey and Mouser are too pricy for you, there are a lot of surplus dealers, you can often find plenty of jelly bean stuff like resistors, 1n4148, 1n400x and whatnot for really cheap. Here's a list of electronics surplus places:
Arrick Robotics* ---* Surplus Electronics Parts List
If you like going out on weekend buying excursions for possible really-cheap surplus parts, hamfests may interest you. Here's a finder for hamfests in the USA:
Hamfests and Conventions Calendar
Surely there are a few hamfests Up There.
I still prefer buying some things new-and-fresh from authorised distributors, such as electrolytic capacitors (which can deteriorate while sitting with no voltage in a surplus warehouse for years or decades).
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