Carlos F Benitez

[Satyam108]

Replacement Part Numbers

From Peter:

The large diodes on the ground line are the MUR3060PT. Its a dual ultra-fast diode for switch-mode power supplies, rated at 30 amps per diode, 600v, and 50ns switching. They share a common cathode, so I only use one of the diodes in each device.

The smaller single diode in the motor circuit can be any fast diode rated for the power, like the uf4007. The exact diode used in the demo is the MUR860G. Its a 10 amp, 600 volt ultrafast diode with 35ns switching.

At Digikey I found replacements for 2 obsolete parts, the MUR3060PT HS diode and the MJL21193 PNP Transistor. The MUR860G is good. Digikey Number:
MUR860GOS - ND for $0.99 each - many in stock.

for the other 2 diodes - MUR3060WTGOS-ND at $4.36 each
and the PNP transistor:
FJP1943RTU-ND at $2.10 each.
Many in stock on both of these - on all three actually.

https://www.digikey.com/

The resistor between the reed switch and the base of the transistor is 24 ohms? I see 24 on one drawing and 24R on the other.

I found the giant switches on Amazon for $9.19 each.

Thanks

Jim

[Satyam108]

Value of a Resistor

From Peter:

RS gave the diode numbers in his presentation last year.

The large diodes on the ground line are the MUR3060PT. Its a dual ultra-fast diode for switch-mode power supplies, rated at 30 amps per diode, 600v, and 50ns switching. They share a common cathode, so I only use one of the diodes in each device.

The smaller single diode in the motor circuit can be any fast diode rated for the power, like the uf4007. The exact diode used in the demo is the MUR860G. Its a 10 amp, 600 volt ultrafast diode with 35ns switching.

The resistor between the reed switch and the base of the transistor is 24 ohms? I see 24 on one drawing and 24R on the other. I'm going for as exact a duplication of Peter's demo as possible.

Thanks
Cheers and Beers

Jim