• Today, 04:15
There's the fundamental frequency and the carrier frequency. The carrier frequency is several times the fundamental. There's no particular formula....
2 replies | 138 view(s)
• Yesterday, 11:01
Consider creating a lookup table. Say you want two digits of precision... Then you need an array of 100 elements. Exponents are a simple matter of...
7 replies | 220 view(s)
• 23rd January 2020, 07:53
Yes, although its specs should be chosen to suit your system. Ampere saturation rating needs to be much higher than 9A. This simulation is a simple...
15 replies | 628 view(s)
• 22nd January 2020, 08:00
The capacitor Farad value can not be too high of course, lest it pass too much current and destroy itself. Probably 1/10 Watt is reasonable....
9 replies | 360 view(s)
• 22nd January 2020, 07:39
Another possibility is a choke filter. This is useful for smoothing current spikes which are typical with capacitor filters. A choke might go on the...
15 replies | 628 view(s)
• 21st January 2020, 06:19
To illustrate here's a simple simulation of 2000uF charging through resistor and diode from 240 VAC source (peaks=340V). Timeframe 1 second. ...
15 replies | 628 view(s)
• 20th January 2020, 09:25
This calculates to average 1A current draw, 400 ohms impedance (in round numbers). That amount has to be achieved by reactive impedance (coils with...
12 replies | 636 view(s)
• 20th January 2020, 08:32
Suppose you pre-charge the capacitors directly from an auxiliary power supply? Install a plain diode and resistor, calculated so caps take a second...
15 replies | 628 view(s)
• 20th January 2020, 03:32
Yes, if your load doesn't change resistance in use. Incandescent lamps increase in resistance when they glow. Normally this throws off your...
17 replies | 944 view(s)
• 20th January 2020, 02:54
Common base mode is suitable. It's tricky to adjust bias voltage and current, in order to find a good operating point. Simple simulation using...
9 replies | 578 view(s)
• 19th January 2020, 08:25
I wouldn't be surprised if the drone has its own step-down converter. High current is needed in R/C aircraft. 25 years ago electric planes typically...
12 replies | 636 view(s)
• 18th January 2020, 06:05
Tether wires appear lightweight and thin, implying low Amperes. I imagine it takes from 100 to 300 watts to lift a drone cam. And it seems convenient...
12 replies | 636 view(s)
• 18th January 2020, 04:01
Simulation of transformer with various loads. Switches were closed in sequence. Scope trace travels to the left. Notice volt reading drops as current...
17 replies | 944 view(s)
• 17th January 2020, 08:20
One diode pointing downward provides 0.6V regulated voltage. Two diodes yield 1.2V. (Similar principle to a zener diode.) A safety resistor is...
20 replies | 835 view(s)
• 17th January 2020, 07:44
One way is to attach various resistors and measure AC volts. That gives you an idea when the secondary output voltage starts to drop, thus letting...
17 replies | 944 view(s)
• 14th January 2020, 10:17
Ordinary multimeters like I've used detect current as DC only. Here's a handy trick to measure AC current: Insert a resistor inline, and measure AC...
5 replies | 631 view(s)
• 14th January 2020, 09:14
Simple diode-resistor-capacitor networks create a gradual ramp-wave when you input a sudden transition. The principle behind the downward ramp...
7 replies | 498 view(s)
• 12th January 2020, 05:50
A voltage doubler can provide your step-up ratio, almost 2x. Two voltage doublers acting symmetrically provide AC to the load. Simulation using...
5 replies | 552 view(s)
• 7th January 2020, 03:22
I once put a voltmeter on the charger for my lawnmower battery. It read 10 or 11 VDC. Yet it was able to charge a 12V battery. I wondered how this...
6 replies | 542 view(s)
• 6th January 2020, 10:43
When starting up your motor is likely to draw several more Amperes than it does during normal running.
12 replies | 983 view(s)
• 5th January 2020, 07:20
175V suggests the unit gets power from house voltage. Is your question about a conventional computer power supply? Do you have a duplicate supply...
1 replies | 474 view(s)
• 3rd January 2020, 07:11
Two similar questions merged into one thread. Try a forum search for words: bist, mbist, scan, dft. Check the list of related topics further...
4 replies | 435 view(s)
• 3rd January 2020, 05:00
Diode D5 is in different positions on the two schematics. I agree with Easy, that D5 allows battery current to 24V circuitry at the right (in either...
67 replies | 4126 view(s)
• 3rd January 2020, 04:38
I have a schematic similar to yours. My simulation shows the incoming signal sources 1mA. It sinks 6mA.
4 replies | 389 view(s)
• 3rd January 2020, 01:22
No. D5 permits current flow only downward (charging) through B2 (lower) battery, never upward (discharging). D5 is faulty because it does not...
67 replies | 4126 view(s)
• 1st January 2020, 06:02
The upper switcher needs particular care about its circuit connections to the upper battery. How it's ground-referenced, whether to positive supply,...
67 replies | 4126 view(s)
• 28th December 2019, 22:18
Here's a self-oscillating astable H-bridge made from transistors. The series LC shapes AC square waves into sines. LC values determine resonating...
17 replies | 1173 view(s)
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