Design
in [Electronics]
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High Input Impedance Single Supply Amp ? I need to make a high input impedance amplifier for a mic preamp with a single supply. I was thinking of using a TL071 (non-inverting) opamp with high resistance bias resistors (to bias the opamp to half the supply voltage) so the input impedance results is aprox. 1MegOhm. But I don't know if such a scheme would w... 16 Jun 2010 02:22
harnessing lightning, or not My Maxwell capacitors hard at work energy from harnessing lightning, see my post with photo, at the CR4 forum. http://cr4.globalspec.com/thread/55751/Lightning-Arrestor#comment579837 -- Thanks, - Win ... 13 Jun 2010 06:08
Ferrite Inductor Tolerance When winding modest inductors of a few hundred milliHenries on a ferrite core, given Al and a number of turns, what is the typical tolerance on the actual value of inductance when these are made in quantity? Cheers Ian ... 16 Jun 2010 16:36
John Larkin's LC oscillator, John Fields' simulation John Fields wrote... On Fri, 11 Jun 2010 07:02:03 -0500, John Fields wrote: On 10 Jun 2010 13:23:55 -0700, Winfield Hill wrote: In a ringing bell application, as the supply voltage sags, and the amplitude drops, I imagine the circuit will move from class C back to class A operation, before ... 14 Jun 2010 21:49
RS485 trouble I have worked allot with RS232, and other serial protocols, but this is my first RS485 project. It seemed straight forward to me, but now I have a big problem. I am using the max490 chip. I'm doing full duplex, 4 wire. Each of my nodes have the max490 communicating with a 16F877A pic chip. The whole project ... 15 Jun 2010 08:42
More PIC fun I have made some webpages with all scripts and software and hardware diagrams for this project: http://panteltje.com/panteltje/pic/scope_pic/remote.html ... 12 Jun 2010 20:25
ferrite machining? Does anyone know of ferrrite can be turned on a lathe? I have a short 1" long by 1" dia. rod ( i know, i know, a personal problem) and I would like to have a grove machined into it to accept a few turns of wire. there will then be a bobbin slipped over that with the secondary on it. I suppose this might be don... 18 Jun 2010 05:53 |