Hi, It sounds like you are off to a great start. Please keep my email handy and I will be here to help you with what ever I can. Oh, by the way, welcome to the...
Welcome. I think you just found a barrel full of mentors! (Bad mental image, I suppose.) These electronics forums are interesting because if one tries to...
The name servers are working again but remember that your browser may have cached the old pages. Usually a simple click of the refresh icon will do the trick....
Ok folks I'm in a dilema... I'd really like to build a radio with more than one station. I followed the plans and made a 2 station radio with my very old 201...
Hi PC, what you really need is more education in electronics! But you know that :-) If you want to try building a more complex radio receiver, I suggest you...
I'll do that, and nice to meet you John. P.C. KC7IPA ... email handy and I will be here to help you with what ever I can. Oh, by the way, welcome to the...
Nice to see you have a sense of humor Charles. I'm sure I'll pick up a bunch of info from you guys as time goes on. Can't say enough how glad I am to have...
Which transistor would you suggest to build the RF amp, an npn3904 or pnp3906? Would you couple the radio signal input at the base with a capacitor? I've been...
The 3904 is a good part to use. NPN bipolar transistors are more "common" than PNP types and tend to have better performance for the price. But in this case,...
... SNIP I forgot the most important warning: DO NOT USE COMPONENT LEAD PLUG BOARDS TO BUILD THIS CIRCUIT !! The boards look like a great answer to quick...
... Does anyone have anything to say about this book: http://www.amazon.com/Experimental-Methods-Design-Amateurs-Library/dp/0872598799 It's written by one of...
... http://www.amazon.com/Experimental-Methods-Design-Amateurs-Library/dp/0872598799 Erik, Just from the cover art it looks like an advanced book for those ...
... http://www.amazon.com/Experimental-Methods-Design-Amateurs-Library/dp/0872598799 ... One of the reader reviews in Amazon claimed the above book was ...
... http://www.amazon.com/Experimental-Methods-Design-Amateurs-Library/dp/0872598799 ... One of the reader reviews in Amazon claimed the above book was ...
Hi Craig, The site you recommended helped a little but was generally too confusing/not very newbie friendly when it came to calculating/designing values for...
at high frequencies,coupling capacitors act as short circuit ; and at low frequencies the transition capacitance act as open circuit... and at the midband...
... wrote: "...y are such differences in each band when the impedence of the capacitors are governed by the same formula Xc=(2(pi)CT)^(-1). do the value of...
... I'm not sure exactly what your question is, but the idea of open circuit and short circuit capacitors is just an approximation. It's useful in reducing...
Transition capacitance is a term used for one component of the capacitance of a semiconductor junction (the other is storage or diffusion capacitance). My...
That makes sense. Thanks, Laurie. Craig ... capacitance of a semiconductor junction (the other is storage or diffusion capacitance). My guess is that this...
... wrote: "... Transition capacitance is a term used for one component of the capacitance of a semiconductor junction..." Thanks for putting those of us who...
Here's a challenge. A friend needs a low cost water depth sensor. Floats, ultrasound etc. are not an option so I'm thinking of a submersible pressure sensor...
... Is it for a permanent or temporary deployment? Back in college a friend did a senior design project around low cost ways to measure water depth. I remember...
Thanks. It's a permanent install to display the lake depth on his website. There's no dock or any way to put a post out there with any of the simple sensors...
This is probably goofy but how about running a thin copper tube into the water sealed at the top with an air pressure sensor in the air cavity? I would pour in...
For some reason I stopped getting email notifications so I haven't been promp in approving new members or in reading posts! If you didn't get approved, try...
Very nice, Charles! The only counter I can think of that is perhaps a *bit* larger with about the same sensitivity are the Russian keychain Geiger counters...
I haven't seen those. This one could be made a lot smaller with surface-mount parts and the PIN diode is essentially two-dimensional so there's room for...
