A
ahonda55
- Jan 1, 1970
- 0
Hi all , i have made this circuit ..
http://img313.imageshack.us/img313/7242/speedswitch8xc.jp
it is a speed switch using LM290
all of the circuit supply is 12
And i had used a 100K variable resistor for R and adjusted it to abou
80
C is .074uF and .01uF for the other capacitor
and i have used a red LED as loa
and i provided a very high frequency as Fin , so the LED is O
but,, when i remove the Fin it always on
what is wrong ?? what is wrong what is wrong ???? lo
i want to let the switch On at about 120Hz , what are R and C value
should i use ??
and what is wrong with my work
Plz help
Thanx a lot :
http://img313.imageshack.us/img313/7242/speedswitch8xc.jp
it is a speed switch using LM290
all of the circuit supply is 12
And i had used a 100K variable resistor for R and adjusted it to abou
80
C is .074uF and .01uF for the other capacitor
and i have used a red LED as loa
and i provided a very high frequency as Fin , so the LED is O
but,, when i remove the Fin it always on
what is wrong ?? what is wrong what is wrong ???? lo
i want to let the switch On at about 120Hz , what are R and C value
should i use ??
and what is wrong with my work
Plz help
Thanx a lot :