Pulsed infrared diode circuit

  
Ql and Q2 form a constant current drive defined by R2. (I approximates to the reciprocal of R2 in the circuit shown for values of I greater than 1 amp). The pulse current is drawn from Cl which is recharged during the time between pulses via Rl.
Pulsed infrared diode circuit - schematic

The value of Cl is determined from the duration and magnitude of the peak current required, and the time constant Rl Cl is determined from the duration between pulses.




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