Build a Nice Load box. Metering, open load 2,4,8 and 16 Ohm all switcheds

[GeorgeP]

Hi to all,
I just finished my universal testing load box for monster amplifiers:
1. Uses 300-Watt 8 Ohm Resistors, fan cooled
2. Has all the switching for:
A. Open Load
B. 2, 4, 8 and 16 OHMS, Power Dissipations based on Impedance chosen...up to 1200 Watts
C. Dual LCD metering for each channel, RMS Volts calibrated.
D. Scope output on BNCs with X10 Voltage divider for each channel
E, Dual Fans for Cooling things down.
All switches use brass screws, made tight and then soldered. All wiring for load carrying is #10 Heavy insulated, and properly crimped with a special tool for those lugs.
Schematic is a .pdf from Orcad and has part numbers for most Items.
Schematic and Pictures below:

 

[WOPL Sniffer]

Cool, I bought mine already done by the SAE/GAS dude himself.

 

[GeorgeP]

Hi to all,
I just finished my universal testing load box for monster amplifiers:
1. Uses 300-Watt 8 Ohm Resistors, fan cooled
2. Has all the switching for:
A. Open Load
B. 2, 4, 8 and 16 OHMS, Power Dissipations based on Impedance chosen...up to 1200 Watts
C. Dual LCD metering for each channel, RMS Volts calibrated.
D. Scope output on BNCs with X10 Voltage divider for each channel
E, Dual Fans for Cooling things down.
All switches use brass screws, made tight and then soldered. All wiring for load carrying is #10 Heavy insulated, and properly crimped with a special tool for those lugs.
Schematic is a .pdf from Orcad and has part numbers for most Items.View attachment 76197View attachment 76198View attachment 76199View attachment 76202View attachment 76200View attachment 76202
Schematic and Pictures below:

 

[GeorgeP]

Cool, I bought mine already done by the SAE/GAS dude himself.

Great! Anybody doing these monster amplifiers needs a reliable accurate load box 4 sure.