Pulsed infrared diode circuit

Posted on Jul 23, 2012

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
Click here to download the full size of the above Circuit.

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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