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• Today, 07:57
Did you try a similar circuit from the examples folder? Did the same problem appear with simpler circuits? Say, a resistor and voltage source? ...
4 replies | 120 view(s)
• Today, 06:03
For an easy thing to try, install a resistor to isolate the sensitive device from the noisy supply. Add a reservoir capacitor as shown below. ...
3 replies | 139 view(s)
• Yesterday, 06:17
You're probably interested in a switching power regulator. A buck converter can give efficient performance. If you really want to obtain 3.8V from...
3 replies | 234 view(s)
• Yesterday, 01:01
To know what's going on you must monitor several readings. You need to know what volt levels go to the fan. You must confirm temperature of the...
7 replies | 358 view(s)
• 13th October 2019, 07:01
Not that I speak from business know-how, but I have a hunch that a programmer who demonstrates excellence (without pay) in view of the community,...
4 replies | 374 view(s)
• 13th October 2019, 04:59
This topic is interesting however eddy currents are invisible and tend to do the unexpected. I'm still trying to get my mind around the way a...
21 replies | 4207 view(s)
• 10th October 2019, 06:34
In some cases you may wish to apply some amount of bias to your photodetector, to bring it to a threshold where it responds reliably to a trigger...
5 replies | 280 view(s)
• 10th October 2019, 06:22
Diode logic can be used as long as your range of voltage is such that one low vote affects the resultant signal causing it to be pulled low. It can...
2 replies | 326 view(s)
• 10th October 2019, 06:02
I have not heard of a smart charger which is able to detect Amp-hour capacity of a random cell. It's a bad idea to charge a cell unless you know...
3 replies | 248 view(s)
• 9th October 2019, 06:44
Vout is a percentage of Vin. The formula is: (4700 + Z) divided by (50M + 4700 + Z) To find Z, make the above formula equal to your desired...
5 replies | 398 view(s)
• 9th October 2019, 01:49
There are sensitive meters which detect live wires behind walls. Sold as '3-in-1' wall scanners. Inexpensive ones cost \$13-20.
6 replies | 666 view(s)
• 8th October 2019, 06:49
With load absent, an unregulated supply tends to rise to the maximum amplitude coming from the transformer. This is true whether filtering is choke...
10 replies | 584 view(s)
• 8th October 2019, 06:20
You can measure current draw of some appliances, but other appliances have an On-Off cycle. Those could use some kind of time-logging device. I...
6 replies | 666 view(s)
• 7th October 2019, 11:09
Capacitive filtering draws short bursts of current. To get 5A output you must supply bursts of current on the order of 30A to 60 A. I*I*R losses are...
10 replies | 584 view(s)
• 6th October 2019, 03:47
Questions: * Do you wish to detect if the pitch is in a strike zone directly above the plate (about 12 inches wide)? * Is a bat or batter's arm...
4 replies | 1131 view(s)
• 2nd October 2019, 06:41
An article about self-healing circuits suggests it's for complex systems with sensors that detect a problem growing, and re-route or shut down...
6 replies | 940 view(s)
• 2nd October 2019, 03:04
The grid dip meter is a useful instrument for radio enthusiasts. It's popular because it's possible to build your own from a few discrete components....
13 replies | 779 view(s)
• 2nd October 2019, 01:49
I believe your observation which demonstrates that moving the center of gravity starts a swinging motion. The apparatus must obey the force of...
84 replies | 3438 view(s)
• 2nd October 2019, 01:07
Many types of oscillators change frequency if you change supply voltage. Or you can 'bend' an RC time constant by changing a resistance somewhere in...
2 replies | 239 view(s)
• 1st October 2019, 01:21
Is your setup an expanded-scale meter? It's made by installing a zener diode inline with the voltage you're measuring. Select a value so 180V yields...
1 replies | 224 view(s)
• 1st October 2019, 01:10
Make the Farad value sufficient so the DC voltage does not change too much from cycle to cycle. 5 or 10 percent ripple is easily noticed on an...
5 replies | 557 view(s)
• 29th September 2019, 21:55
Is your scope dual channel? The obvious (and direct) hookup is to ground the scope at one node of the delta, and probe the other two nodes. The scope...
11 replies | 516 view(s)
• 29th September 2019, 20:29
Here in the US, house wiring once had 2 wires only. I saw appliances that gave me a shock if I touched them and a metal faucet simultaneously. Or if...
40 replies | 1901 view(s)
• 29th September 2019, 18:28
Create a virtual ground from 3 resistors (say 100k ohms). 1) Join one end of all resistors, in a Y shape. At center is your oscilloscope ground. ...
11 replies | 516 view(s)
• 29th September 2019, 16:33
Things to check: * Does the power supply maintain stable voltage? * Does the camera start to draw overmuch current? * Does the camera expect...
1 replies | 707 view(s)
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