Hi
I found this schematic the other day and assembled using 2N3772 (instead of 2N3055), TIP31 (instead of BD135) and 24V 2A transformer. The transistor is mounted on a heatsink.
I have two issues:
a) When powered on with the POT at minimum, the output goes to about 12V. It takes a minute or so to come down to its minimum voltage.
b) When used for only 5 minutes or so, 2N3772 got hot enough to burn my fingers. Is it normal? Do I need a larger heatsink and/or cooling fan?
I found this schematic the other day and assembled using 2N3772 (instead of 2N3055), TIP31 (instead of BD135) and 24V 2A transformer. The transistor is mounted on a heatsink.
I have two issues:
a) When powered on with the POT at minimum, the output goes to about 12V. It takes a minute or so to come down to its minimum voltage.
b) When used for only 5 minutes or so, 2N3772 got hot enough to burn my fingers. Is it normal? Do I need a larger heatsink and/or cooling fan?