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2 votes

Controlling SMPS with SSR (Blinking SMPS)

It happens because of SSR leakage current. The SSR leaks up to 4mA, and SMPS leaks only up to 2mA. Therefore the SMPS input cap charges up slowly to a voltage level which starts it running. But it ...
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1 vote

Cheapest solid-state way to turn a 240 VAC, 15 W resistive load on/off

If you want to be able to switch the load on and off at specific points on the sine waveform, a photo-MOS device might be ideal. The TLP240 can handle 120 mA and 400 volts, and is in stock at Mouser ...
  • 2,161
7 votes

Cheapest solid-state way to turn a 240 VAC, 15 W resistive load on/off

A power of 15W over a cycle into a resistive load is only 68mA RMS. If your load is really just resistive you might be able to use a phototriac to drive the load directly. This app note mentions the ...
1 vote

How to control my DOL starter buttons (ON and OFF) with NodeMCU of my 1.5 hp motor (motor starter/panel) to control it remotely?

The requirement is to introduce remote motor control while retaining the existing push button control. Two relays would be required to emulate the green 'start' and red 'stop' push button functions. ...
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4 votes
Accepted

Switching negative PWM 24v 5A

So basically I need to switch the negative wire from my board to another board when required by my microcontroller. Use a positive to negative level switch like this: - When the logic level is high, ...
  • 396k

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