Amplified Music Circuit (Light Sensor) help

Thread Starter

renze

Joined Jul 29, 2009
6
I try fixing up this circuit but it don seem to work at all
any 1 try help me find the error in the circuit please.

 

Wendy

Joined Mar 24, 2008
23,415
What are you trying to do, and what are your results? Once a SCR is tripped it stays on, until the current going through it is stopped.
 

bertus

Joined Apr 5, 2008
22,270
Hello,

I can not find a datasheet for the music IC.
I think there is to much voltage drop across the SCR for the music IC to work.
Does the music IC function when connected directly to the battery?

Greetings,
Bertus
 

Thread Starter

renze

Joined Jul 29, 2009
6
im sorry, i see wrongly

the music IC: BT66T-12L

so i will need to add resistor for the music Ic to work ?

yes the music Ic function once battery is connected
 
Last edited:

bertus

Joined Apr 5, 2008
22,270
Hello,

For the safety of the music IC and the transistor put a resistor of 2K7 - 4K7 between the music IC output and the base of the transistor.

As I understand the SCR does not swtich.
The SCR you use is large for the application.
The problem will be the holding current of the SCR.

Greetings,
Bertus
 

Audioguru

Joined Dec 20, 2007
11,248
Look at its datasheet.
You have the pins of the music IC connected backwards.
The transistor needs to have a series base resistor as shown in the datasheet.
The IC needs to have a supply bypass capacitor as shown in the datasheet.
 
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