3
\$\begingroup\$

Here is a rather bad (low resolution, grainy) picture of a circuit board that claims to be a 2-channel 315MHz ASK/OOK type remote controlled relay set. I can identify the relays, but not the big blue boxy thing behind them (see picture, with red-arrow).

enter image description here

Can someone help identify what it is ?

Also, is that white thingy labelled "Carli" part of this blue part, or separate ?

\$\endgroup\$
1
  • 2
    \$\begingroup\$ The yellow part is a separate component. It's a class X capacitor manufactured by Carli Electronics carli-cap.com.tw \$\endgroup\$
    – m.Alin
    Jan 11, 2012 at 14:21

2 Answers 2

8
\$\begingroup\$

The blue part is a transformer (should be reasonably heavy). The "Carli" labeled part is probably a capacitor.

enter image description here

http://uk.farnell.com/block/vb1-5-2-9/transformer-1-5va-2-x-9v/dp/1131629

\$\endgroup\$
1
  • \$\begingroup\$ Thanks @Armandas. I do not have the board with me, so couldn't confirm whether it is heavy. \$\endgroup\$
    – bdutta74
    Jan 11, 2012 at 17:11
5
\$\begingroup\$

Blue device is probably an iron core transformer. A better photo would allow website to be read.

That's probably a mains cord entering at top right.

Yellowish Carli components is probably an X filter cap - MAY be a line filter but probably not.

Bottom right - 4 diodes are probably bridge rectifier for power supply.

Picture is truncated but object at bottom left is probably an ASK/OOK or similar RF module - probably Rx/Tx
Silver button thing may be a SAW filter / oscillator.

Black cubes are relays.

So, yes, it could be what it claims to be.

A better photo would help. - object at lower left is key to RF aspects.

Guesstimated objects:

enter image description here

\$\endgroup\$
1
  • \$\begingroup\$ Thanks @Russell, for the comprehensive answer and labelled pic. It so happens that this is first time I am seeing an encapsulated PCB-mount transformer! The IC labelled "???" is very likely to be the RF decoder IC. It is indeed a SAW resonator based 315MHz OOK module (as per specs). Any idea if the "yellow" spring-type terminal block is for the AC power (fed to Relays) ? Seem a trifle too small (& possibly under-spec'd) for mains power, no ? I'd have expected the AC connectors to be the larger screw-type ones. \$\endgroup\$
    – bdutta74
    Jan 11, 2012 at 17:17

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.