All Questions
Tagged with capacitive power-supply
12 questions
8
votes
1
answer
5k
views
Driving LM3886 at 100 KHZ in Bridge Tied Load (BTL) configuration?
Would someone have experience with driving a pair of LM3886 Overture Power Amplifiers in BTL with up to 100 KHz sine wave?
My parameters:
Frequency band of interest: 20KHz to 100 KHz, sine wave
...
- 50.7k
4
votes
2
answers
2k
views
Capacitive load of PSU
I see many power supplies have a parameter called max capacitive load. In this case for the below PSU, it is 2200uF.
What does this mean exactly?
I cannot measure the capacitance of the load easily so ...
- 2,657
3
votes
1
answer
1k
views
How to drive and control capacitive load?
There is electrochromic film (which is some kind of capacitive load) that need to be driven with 50Hz alternating current, load voltage should be controlled in range 0-100V (with 8 or more fixed ...
- 65
3
votes
2
answers
375
views
Can transformerless power supplies be UL/CSA certified and is there any specific standard they must meet?
I am trying to bias a linear optocoupler on the AC mains side of a circuit, in order to transfer analog information to the secondary side of the circuit. I have designed the following capacitive power ...
- 319
2
votes
2
answers
4k
views
ATtiny13a capacitive power supply
I would like to power my Attiny13a MCU with a transformerless capacitive power supply. The MCU itself needs only a few milli amps and it will drive 2 LEDs at 15mA each through it's digital pins. So I ...
- 712
2
votes
1
answer
2k
views
Need help for calculation of this capacitive power supply
Look at this circuit. It's an almost complete capacitive power supply with necessary part.
simulate this circuit – Schematic created using CircuitLab
I have trouble calculating:
the input ...
- 818
0
votes
1
answer
209
views
capacitive power supply design query
I was trying to make an LED lamp with 16 series 3528 SMD LED chips. I am planning to use a transformerless capacitive power supply to step down 230V.
As per my calculation 16 led will require the ...
- 19
0
votes
1
answer
86
views
capacitive power suplply
i have following doubts about capacitive power supply or transformerless power supply...
what will be real power drawn, will it be 230 x (current flowing through C1) or 6 x (current flowing through ...
- 103
0
votes
0
answers
58
views
Variac and Other dropper in line
I have a beautiful old variac, with a sliding (rotating) center contact.
I would love to use this on a nice LED string inside a glass bulb on top of the device.
But also, use the variac as the dimmer, ...
- 140
0
votes
1
answer
76
views
Suggestion on Power supply design
I am looking for Transformerless power supply design. I have MCU 5V. and would like to drive 12V/24V relay with single LED.
i have 4 pots 10K/200k for timing
So i prefer 230VAC to 12V/24Vdc output ...
- 25
0
votes
0
answers
155
views
Capacitive Power Supply Torch
I'm an amateur at electronics circuitry and concepts. I have designed a simple capacitive power supply using few web images and brief lessons. I understand that this type of transformerless power ...
- 91
0
votes
1
answer
173
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powersupply ac to ac
I have recently bought a dcp917S and hoped I finally found a wireless chime that I can tie into my apartment buildings bell system. Since I live for rent there I can't do any changes that are not ...
- 11