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Jan Dietz

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Posts posted by Jan Dietz

    Switching adapter current output

    in The Electrical Forum

    Posted

    If it's in the device being charged, you don't measure it in this scenario.

    If it's in the power supply, you will measure average voltage, as the multimeter doesn't respond quick enough to show the PWM.

     

    Anyway, for this to happen there will be additional negotiations between the device and charger, and the OP wants to discuss a SMPS, not a charger.

    Switching adapter current output

    in The Electrical Forum

    Posted

    You will still need a way to load the power supply with 2 amps somehow. If you have a way to do that (lights, phone, random stuff) you can measure the amperage with the multimeter in series, and if you're happy you're drawing 2A, measure the voltage under load and see if it still is within specs.

     

    (+) -- (Multimeter in Amp range) -- (Load)--- (-)

    • Like 1

    Switching adapter current output

    in The Electrical Forum

    Posted

    Volt meter, Amp meter and 2A load (10W resistor or a few lights), measure Amps and at 2A voltage drop should be within nominal.

     

     

    This will get you into the ballpark:

    https://th.rs-online.com/web/p/panel-mount-fixed-resistors/1073302

     

    Little cheap meter you can leave in circuit:

    https://www.lazada.co.th/products/original-dc100v-10a-i1629992789-s4492640371.html?spm=a2o4m.searchlist.list.4.29906b98Cdb0Za&search=1

     

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    How about a solar car port on a budget?

    in Alternative/Renewable Energy Forum

    Posted · Edited by Jan Dietz

    I received the tiny little boards I linked above and they work very nicely. Was a bit of a pain to track down the correct connections, but here it is:

     

    https://github.com/Heltec-Aaron-Lee/WiFi_Kit_series/blob/master/PinoutDiagram/WIFI Kit 8.pdf

     

    Works fine with the Adafruit library 

    #include <SPI.h>
#include <Wire.h>
#include <ESP8266WiFi.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 32 // OLED display height, in pixels
#define OLED_RESET    16 // Reset pin # (or -1 if sharing Arduino reset pin)

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // 0x3C is address of the display
  display.display;
}

     

    1602509480204.JPEG.af24f0740d96f5ac2d9442d6178a1cf5.JPEG

    • Like 3
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    Question about a circuit

    in The Electrical Forum

    Posted

    Ah yes, direct power from mains, a great way to electrocute yourself AND your friends ????

     

    Pure resistive works but as you might have noticed it's a much better heater than a light source.

    If you do insist on living on the edge, here is a great app note from Microchip regarding resistive and capacitative power circuits, including the formulas to calculate your components:

    http://ww1.microchip.com/downloads/en/AppNotes/00954A.pdf

    • Like 2
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    Question: Power Supply for Vacuum Tube

    in The Electrical Forum

    Posted

    This one might suit you even better, a little smaller, and more of your requested voltages:

    https://www.aliexpress.com/item/32919273039.html?spm=a2g0o.productlist.0.0.51bd707eiR824C&algo_pvid=b2307040-f8ef-4e1c-80b2-fbcaab792842&algo_expid=b2307040-f8ef-4e1c-80b2-fbcaab792842-14&btsid=0ab6d59515933733158348887ee766&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_

     

    Input voltage:AC220V(red, red)

    Output high voltage:AC230V-0-230V 40MA

    Two groups of output filament voltage

    ①Single group AC6.3v 1a:  

    ② Single group AC13V 0.6A 

    • Like 2
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