If you are bored..
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Negistor
- Thread starter brandon7861
- Start date
I was playing with this last night. If a resistor is used with the LED, it obviously can't oscillate very fast because of the discharge delay, so if you want higher frequencies, there has to be a low collector (load) resistance.
With ear buds as the load, the sound of the pulses remind me of the pulses from a tens unit. I bet this circuit could drive a small HV transformer.
I am also wondering about using it as a driver for an ultrasonic transducer. Capacitor type matters too. I was using 10uF ceramic caps last night and the audio tone would change noticeably by breathing on the capacitor. Gave me a new appreciation for capacitor thermal stability for sure.
I lost most of them already, but last night I was thinking of all sorts of things to do with a circuit like this. I wonder if it could ring a coax stub and generate audible AM at the stub frequency or if the rise time would need to be faster.
With ear buds as the load, the sound of the pulses remind me of the pulses from a tens unit. I bet this circuit could drive a small HV transformer.
I am also wondering about using it as a driver for an ultrasonic transducer. Capacitor type matters too. I was using 10uF ceramic caps last night and the audio tone would change noticeably by breathing on the capacitor. Gave me a new appreciation for capacitor thermal stability for sure.
I lost most of them already, but last night I was thinking of all sorts of things to do with a circuit like this. I wonder if it could ring a coax stub and generate audible AM at the stub frequency or if the rise time would need to be faster.