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2 Threads found on edaboard.com: Pwm 2n3055
An obvious problem of the circuit in post #3 is that the transistor is operated as a source follower with 5 to 10 V voltage drop, not as a switch. In the 2n3055 circuit, the transistor voltage drop and respective power dissipation is even higher. Nothing that we would expect from a "pwm" circuit.
Hi all, I need a variable power supply to control 2 H bridges which drive 2 DC motors. The max output current and voltage is 5A and 20V respectively. I have designed the following circuit based on Dave Jones's lab supply where the output voltage and current is set by filtered pwm signals. What can I do to improve the stability and quality on