This circuit for battery powered laser diodes was found in a 1992 RE Experimenters Handbook. The circuit uses common components today.
We found this circuit in a 1978 publication. The diodes can be 1N4002 or 1N4004 and the secondary of...
This circuit was obtained in a 1985s English magazine. The circuit can still be assembled with...
This configuration of PWM control with the LM317 was found in a Popular Electronics from the 90s....