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Search: Posts Made By: billbehen
Forum: The Projects Forum 12-29-2011, 08:12 PM
Replies: 8
Views: 1,071
Posted By billbehen
Another problem you'll face is that the output...

Another problem you'll face is that the output current of a solar cell (a panel is just many of them in parallel and/or series) has an output current capability that depends on the output voltage,...
Forum: The Projects Forum 12-29-2011, 07:40 PM
Replies: 95
Views: 11,988
Posted By billbehen
You are worying too much! Vd, the drain voltage...

You are worying too much! Vd, the drain voltage will never be 28 Volts DC. Due to the inductor, Vd will either be just under 100Volts when the switch is turned ON, and will be about GND when the...
Forum: The Projects Forum 12-29-2011, 07:28 PM
Replies: 16
Views: 2,012
Posted By billbehen
To eliminate diode drop non-linearity you need a...

To eliminate diode drop non-linearity you need a "precision rectifier" as in http://www.site.uottawa.ca/~rhabash/ELG4135L8.pdf
Forum: The Projects Forum 12-27-2011, 06:39 PM
Replies: 9
Views: 5,167
Posted By billbehen
In general, your dynamo is a current generator,...

In general, your dynamo is a current generator, rather than a voltage source. This means that, it will push a certain current whether or no. In other words, when unloaded, or lightly loaded, the...
Forum: The Projects Forum 12-27-2011, 06:26 PM
Replies: 7
Views: 1,775
Posted By billbehen
I'm not much on RF design, but does the source or...

I'm not much on RF design, but does the source or load impedance have more effect with a matching circuit than with a plain filter? As the frequency increases past 200MHz, maybe one or the other of...
Forum: General Electronics Chat 07-16-2011, 12:07 AM
Replies: 5
Views: 1,272
Posted By billbehen
Driving a reactive load from a linear amplifier...

Driving a reactive load from a linear amplifier is maybe asking for trouble. The output power from the amp comes from the emitter of the power transistors, which is a PN junction, and thus only...
Forum: General Electronics Chat 07-15-2011, 11:51 PM
Replies: 3
Views: 1,165
Posted By billbehen
Soldered coax sounds like a good idea. In...

Soldered coax sounds like a good idea. In theory, you need to match the impedance of the cable to that of the oscilloscope. Sometimes scopes have a switch for low impedance measurements with a...
Forum: General Electronics Chat 07-15-2011, 11:33 PM
Replies: 11
Views: 1,573
Posted By billbehen
When I was just stating out as a EE, the man I...

When I was just stating out as a EE, the man I worked for said that some op amps would work with direct connection of output to negative input, but that not all op amps would. Maybe whoever was...
Forum: General Electronics Chat 07-15-2011, 11:10 PM
Replies: 9
Views: 1,920
Posted By billbehen
If you do use a cap in the input side, make sure...

If you do use a cap in the input side, make sure it's bipolar for safety's sake!
Forum: General Electronics Chat 07-15-2011, 11:05 PM
Replies: 23
Views: 1,971
Posted By billbehen
Since when is 1993 old.....

Since when is 1993 old.....
Forum: General Electronics Chat 07-15-2011, 11:01 PM
Replies: 12
Views: 6,711
Posted By billbehen
The black parts would be ferrite. See Magnetics...

The black parts would be ferrite. See Magnetics Inc. or Ferroxcube for info. You should be able to locate the exact part by careful measurement of the dimensions of the core in comparison to the...
Forum: General Electronics Chat 07-15-2011, 10:48 PM
Replies: 4
Views: 2,651
Posted By billbehen
With the connection shown, the two 1KOhm...

With the connection shown, the two 1KOhm resistors will not damp the LC tank's resonance at all, if the L and C are ideal, as you show them.

Near resonance (about 5Ghz as mentioned above) the...
Forum: General Electronics Chat 07-15-2011, 09:46 PM
Replies: 2
Views: 897
Posted By billbehen
The circuit you show is not really an active...

The circuit you show is not really an active filter, but rather a two stage low-pass RC filter with a voltage follower to buffer the output. In other words, the op - amp doesn't enter into the...
Forum: General Electronics Chat 07-15-2011, 09:29 PM
Replies: 5
Views: 1,014
Posted By billbehen
Lead-free is supposed to be safer for the factory...

Lead-free is supposed to be safer for the factory worker. 60/40 rosin core is standard, do not use acid core for electronics, it eats up components & boards.
Forum: General Electronics Chat 07-15-2011, 09:24 PM
Replies: 14
Views: 2,012
Posted By billbehen
Depends on the application! Is this a power...

Depends on the application! Is this a power supply or other power circuit, or an RF circuit, or audio isolation? Wire size/length determine DC resistance & thus power handling capability. Fewer...
Forum: General Electronics Chat 03-17-2011, 10:35 PM
Replies: 6
Views: 1,304
Posted By billbehen
since they are out of phase, positive current is...

since they are out of phase, positive current is coming from one phase and (somewhat) returning through the other as it goes negative. but as mentioned above you'll have an imbalance. regular two...
Forum: General Electronics Chat 03-17-2011, 10:30 PM
Replies: 2
Views: 1,302
Posted By billbehen
sounds OK if you have the right DC available for...

sounds OK if you have the right DC available for the NOR gate, assuming the result only has to be logic level i.e. you're not actually switching some signal or a power level with lots of mA
Forum: General Electronics Chat 03-17-2011, 10:26 PM
Replies: 10
Views: 1,776
Posted By billbehen
What if you don't use a cap at all, then...

What if you don't use a cap at all, then overamplify with an op-amp to sky the voltage as soon as you have any rectified signal at all? The op-amp will just max out at its positive input voltage. ...
Forum: General Electronics Chat 03-17-2011, 10:20 PM
Replies: 18
Views: 2,187
Posted By billbehen
Didja ever hear the old joke Patient: Doc it...

Didja ever hear the old joke
Patient: Doc it hurts when I do this.
Doctor: Then don't DO that!!!

haha ok so im jealous
Forum: General Electronics Chat 03-17-2011, 10:18 PM
Replies: 4
Views: 1,630
Posted By billbehen
sounds pretty good. anytime its AC vs DC think...

sounds pretty good. anytime its AC vs DC think capacitor
Forum: General Electronics Chat 03-17-2011, 10:16 PM
Replies: 3
Views: 1,042
Posted By billbehen
U4 flip-flops, u6 inverters boost level, xfmr...

U4 flip-flops, u6 inverters boost level, xfmr blocked by C58, diodes rectifiy signal (smoothed by e'lytic,) r41 prevents core wandering, turns ratio set to put out +11volts. Maybe indicator maybe...
Forum: General Electronics Chat 03-17-2011, 10:10 PM
Replies: 14
Views: 2,940
Posted By billbehen
PWM with MOSFET

The main reason one uses pwm is that the FET is either ON or OFF. It only dissipates a little during ON due to slight ohmic resistance, and dissipates very little when OFF (just a tiny amount of...
Forum: General Electronics Chat 09-03-2009, 07:51 PM
Replies: 6
Views: 1,119
Posted By billbehen
Since the voltage you're regulating is like...

Since the voltage you're regulating is like 15Votls max then maybe a 60Volt part would work? As for amps, i agree that size and general apprearance would guide you so far a total power rating. ...
Forum: General Science 09-03-2009, 07:38 PM
Replies: 5
Views: 2,425
Posted By billbehen
Boiling

You probably know that classically, most substances will begin to boil at a certain temperature, and will continue to vaporize at that temperature with the addition of heat energy.

But there are...
Forum: General Electronics Chat 10-10-2007, 10:03 PM
Replies: 3
Views: 2,511
Posted By billbehen
Troubleshooting is not always easy! Maybe one of...

Troubleshooting is not always easy! Maybe one of the Resitors or other parts is shorted or open?
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