If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #1389
Joined: Thu Mar 13 2008, 12:50AM
Location: Pittsburgh, PA
Posts: 346
Well, after a few months of scavenging for parts, I've finally decided to actually order a small collection of parts so I don't have to scavenge as much for parts that I may need regularly. A large reel of 1N4007's is already on my list, and I am looking at ordering 100 or so BD139/140s that seem to be common in push-pull amps. The IRFP250 and 450 seem common, and I may order a few of those as well. I am also looking for an LCR meter and a high quality VI multimeter. I am definitely going to order an assortment of resistors and caps, but I am unsure as to what to order since there are so many different values and types to choose from. Any pointers would be much appreciated.
Now I am wondering what parts you all have found that it is nice to have on hand for those pick up projects. Is there anything that I seem to be missing from pieces that seem to find their way into many moderately difficult projects? Thanks ahead of time.
Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
For small capacitors and resistors, I bought the assortments at radioshack. That the only use i see in that store parts-wise.
Also, dont' forget to find a nice place to organize all the stuff. I have one of those little cabinets with like 25 plastic drawers, so I can just label them diodes, resistors, transistors, capacitors, etc.
Registered Member #1320
Joined: Sat Feb 16 2008, 01:31AM
Location:
Posts: 67
a nice set of breadboards and various solid stripped and bent wire segments if you don't already have some. Optoelectronics. a nice spectrum of resistors (it's a pain when you have to make a trip or order jsut because you need a couple resistors). perhaps some DIP 8 bit switches. All small things that come in handy. Ebay listings are always good for these things
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Get a lot of 100nF low voltage foil caps, these are used for decoupling everywhere... Also the obligatory parts such as NE555 or TL494, you might as well get a KA/SG3525 which is similar to TL494 and has better output stage.
If you don't have one already, get an isolated low power variable PSU (with something 3-24V 0.3A or so, isolation comes in handy when operating circuits that are directly connected to mains) for powering all kinds of things - control circuits, GDT drivers etc., or you can build one yourself.
Also get a set of voltage stabilisators, IC sockets, perfboards or a breadboard too.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Firefox wrote ...
Well, after a few months of scavenging for parts, I've finally decided to actually order a small collection of parts so I don't have to scavenge as much for parts that I may need regularly. A large reel of 1N4007's is already on my list, and I am looking at ordering 100 or so BD139/140s that seem to be common in push-pull amps. The IRFP250 and 450 seem common, and I may order a few of those as well. I am also looking for an LCR meter and a high quality VI multimeter. I am definitely going to order an assortment of resistors and caps, but I am unsure as to what to order since there are so many different values and types to choose from. Any pointers would be much appreciated.
Now I am wondering what parts you all have found that it is nice to have on hand for those pick up projects. Is there anything that I seem to be missing from pieces that seem to find their way into many moderately difficult projects? Thanks ahead of time.
Why in world would you need 100 BD139 and 140?
If you are going to order power devices, I'd rather look around something larger than IRFP450.
50N50 mosfets, hgtg20N60a4D IGBT's and similar are great choices as I see, if you are after solid state tesla coils. If you need faster mosfets those will usually be the smaller ones.
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Dr. Arc flash wrote ...
Why in world would you need 100 BD139 and 140? If you are going to order power devices, I'd rather look around something larger than IRFP450.
I daresay I'm to blame for their popularity. I don't use them for any reason other than that I got a pack of 50x BD139s and 50x '40s cheap once, and my cache of IRFP450s dominates my preferred choice of mosfet. Do like Marko says and look for better components. For simple push-pull amps find transistors with high gain and speed. BD1XX's are for audio amps, and have rather low gain. (Not to say they don't well though!) Hell, they might even be more expensive than more able transistors, I've never checked.
Get some operational amplifiers too, they're useful to have and can do anything. Make sure they have a push-pull output stage, otherwise they can't source current.
Registered Member #1408
Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679
When I ordered resistors I ordered them in 2w and even a few higher. The cost level for what spectrum I wanted was reasonable as the fill-in small scale stuff could be bought at Radio shack for a dollar or two.
I also made sure to order non-polarized caps. The polarized stuff I had was almost able to fill a grocery bag from TV's & monitors. But non-polarized stuff especially in HV or at large capasitence was tough to get without placing an order.
Registered Member #952
Joined: Mon Aug 13 2007, 11:07AM
Location: Finland
Posts: 388
What about also some UCC37321/22? These might be useful if you are into building SSTCs. And hey, it would be also good to buy some good ferrite toroids for GDTs; you never know about those you pull from a dead whatever device.
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.
Putting in a First Order for Parts
Do like Marko says and look for better components. For simple push-pull amps find transistors with high gain and speed. BD1XX's are for audio amps, and have rather low gain. (Not to say they don't well though!) Hell, they might even be more expensive than more able transistors, I've never checked.