Enhancements:

• Diodes protect regulator from reverse polarity and reverse bias. Prevents soundcard-frying over voltage.
• Four LEDs show presence of the four main power rails on the ISA bus.
• Dual copper heatsink pads embedded into PCB design to keep regulator cool.
• Jumper to disable Voltage Blaster without removal. Can be used to verify lack of (-)5V on ISA bus.

The datasheet for the 79xx series negative regulators strongly recommend two protection diodes. PCs get shutdown suddenly and sound cards have lots of capacitance. The exact two situations described here.

Why do I need a Voltage Blaster?

Modern (ATX) power supplies DO NOT provide –5V to Vintage AT motherboards.
Some AT motherboards will give an error on boot if –5V is missing.
Some ISA sound cards require –5V to work properly.
Some ISA network cards require –5V to work properly.

ENIG PCBs.

Dual protection diodes to prevent damage to your precious vintage sound cards!

LED indicators for each ISA voltage.

Enable/Disable jumper for diagnostics.

Copper heatsink integrated into PCB.