Hi guys,
I'm trying to make a LED blink to the sound of the music captured by a microphone.
I used PSpice to simulate the circuit:
**broken link removed**
(The 1k Resistor at VIn is the mic impedance)
That's the Bias Point simulation.
And this is the transient simulation for a 500Hz frequency:
**broken link removed**
(Yellow is V in the collector, Purple/Blue is Voltage at the LED, Green is Voltage at the base; In the upper plot we see the current in the LED)
After that, I tried to build the circuit and expected the led to turn off when I talked to the mic.
But... Nothing![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Here's the results I've got:
Voltage at the base:
**broken link removed**
Max amplitude at 580mV, similar to the simulation.
Voltage at the collector:
**broken link removed**
Constant![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
LED always on =/
Photo of the circuit:
**broken link removed**
What did I do wrong?![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Thanks in advance
I'm trying to make a LED blink to the sound of the music captured by a microphone.
I used PSpice to simulate the circuit:
**broken link removed**
(The 1k Resistor at VIn is the mic impedance)
That's the Bias Point simulation.
And this is the transient simulation for a 500Hz frequency:
**broken link removed**
(Yellow is V in the collector, Purple/Blue is Voltage at the LED, Green is Voltage at the base; In the upper plot we see the current in the LED)
After that, I tried to build the circuit and expected the led to turn off when I talked to the mic.
But... Nothing
Here's the results I've got:
Voltage at the base:
**broken link removed**
Max amplitude at 580mV, similar to the simulation.
Voltage at the collector:
**broken link removed**
Constant
LED always on =/
Photo of the circuit:
**broken link removed**
What did I do wrong?
Thanks in advance