Comments on: Transformerless Power Supply Circuit

By: Alonso

Alonso — Wed, 24 Sep 2014 19:01:35 +0000

So far are you telling a tank circuit (a condenser and resistor in parallel) will change voltage from 127 volts to 12 volts ?

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By: Denis

Denis — Fri, 27 Jun 2014 15:27:28 +0000

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By: Abhinav Chaitanya

Abhinav Chaitanya — Mon, 28 Apr 2014 12:45:13 +0000

In reply to Jestine Yong.

Thanks Jestin.

No, I have not added ground as part of the circuit.

However, I have included ground with a LED circuit to indicate whenever there is reversal of Line and Neutral. This LED lights up to warn the reversal.

The Mosquito repellent circuit is as shown at the following site:
http://www.electroschematics.com/35/electronic-pest-repeller-mice-repellant/

Else where when I was studying it, it was named Mosquito repellent circuit.

The purpose of using transformerless power (tlp) supply was to keep the weight of the project minimum and easy to carry while travelling. Although, I have made provision to supply power externally from a power adapter in case the tlp supply fails.

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By: Jestine Yong

Jestine Yong — Fri, 25 Apr 2014 03:05:10 +0000

In reply to Robert.

Hi Robert,

You are right.

Jestine

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By: Robert

Robert — Thu, 24 Apr 2014 22:07:49 +0000

Hi Mr. Yong,
Personally, I think they are too dangerous. Transformers are not that expensive, and I think the isolation is worth it.

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By: Jestine Yong

Jestine Yong — Thu, 24 Apr 2014 12:38:41 +0000

In reply to Abhinav Chaitanya.

HI Abhinav,

I did not notice it and have not build such circuit before. Have you tried adding the ground?

Jestine

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By: Abhinav Chaitanya

Abhinav Chaitanya — Thu, 24 Apr 2014 05:23:20 +0000

Hi,

I had an occasion to use this circuit for my electronic mosquito repellent with tweeter. I noticed that when line and neutral is reversed at the source, I get shock on the tweeter.

Can you explain why this happens and how this can be corrected ?

I do not know if you have noticed. In this circuit when line and neutral is reversed

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By: Jestine Yong

Jestine Yong — Sat, 05 Apr 2014 09:01:57 +0000

In reply to GIRISh.

Fuse resistor (FR).

Jestine

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By: GIRISh

GIRISh — Thu, 03 Apr 2014 13:14:44 +0000

Thank you for circuit.
sir, What is FR 100R?

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