CAN SOMEONE SUGGEST ME IN BELOW CKT .HOW cil187/188 CAN BE USED FOR CURRENT LIMING CKT.
Please check if this is what you are looking for:
https://www.electronicdesign.com/power/current-limiter-offers-circuit-protection-low-voltage-drop
WHAT WAS THAT AGAIN? I DIDN'T HEAR YOU!!
A BC847C SMALL SIGNAL SOT23 SMD TRANSISTOR TO DRIVE AN 8OHM SPEAKER IN CLASS-A?
YOU MUST BE JOKING.
THE 2SC9013 IS RECOMMENDED (TRANSISTOR FOR POTABLE :o RADIO) IN THE UM3561 DATASHEET.
A 2N2222 COULD DO. OR BETTER STILL, SOME PAM830x CLASS-D AMPLIFIER BREAKOUT BOARD.
IS THAT TOGGLE SWITCH USED TO POWER THE CIRCUIT OR SHORT THE SUPPLY TO GROUND?
NOTE THE 3.6VOLT ABSOLUTE MAX OF THAT CHIP.
6VOLT (7806) IS GOING TO FRY IT.
REGULATORS LIKE THAT 7806 NEED A CAP ON THE INPUT AS WELL AS ON THE OUTPUT.
LEO..
OP's schematic:
Interesting way of rectifying you use.
That 7806 won't fare well without output capacitor, and the emitter of T2 is not connected to anything.
Does anyone have some earplugs available? It's so noisy!
wvmarle:
Does anyone have some earplugs available? It's so noisy!
IT'S JUST A STATE OF MIND!
The big letters will not hurt you.
Steve
Hi,
What is it you want to do?
You first post is not very legible.
Do you want to limit the current through a loudspeaker?
If so why?
Tom... 
That’s just a center tapped full wave rectifier. One we don’t use much because transformers get big and expensive.
Actually, I just realized -- the OP is LOUD because their SPEAKER needs a LIMITER!
That toggle switch is pretty good one