Before I get electrocuted...

captainkirksdog

Member

• Dec 1, 2003

• #1

Hi,
Before I get electrocuted I thought I'd better get some help. How can I use two triacs to control BOTH sides of a 220-volt line simultaneously? (60Hz-USA) I can't use just one because the load is referenced to neutral/ground on both sides. Any thoughts?

 

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Sebi

Active Member

• Dec 1, 2003

• #2

You need two triac (for each phase)

 

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captainkirksdog

Member

• Dec 1, 2003

• #3

Thanks, Sebi.
Question: Should a diac be used in the path of the phototransistor? Most data sheets I've seen require one. What does it actually do?

 

Sebi

Active Member

• Dec 3, 2003

• #4

DIAC is a trigger device, useable in dimmer circuits. For on-off switching no need. Or You need a dual-dimmer?

 

captainkirksdog

Member

• Dec 3, 2003

• #5

Hi Sebi,
No dimmer, just on-off. Thanks for the help.

 

A

Agent 009

New Member

• Dec 4, 2003

• #6

What's a diac and triac?

 

captainkirksdog

Member

• Dec 4, 2003

• #7

Hi Agent 009,

Triacs and diacs belong to a special group of semiconductors known as "thyristors". This link might answer your question better than I can:

**broken link removed**

Good luck!

ps-If you like AC projects, download all of Teccor's app notes! They're great!