captainate
Member
Hey folks,
Been working on a DIY Project and built the power supply for it today. It's a bass DI based on the A-Designs REDDI from the GroupDIY forum. Things are a little slow over there, and this issue isn't specific to the project, so I thought I'd ask the question here. I'm getting 288V from the B+ output, and 5.3V from the DC Heater supply. These figures come from measurements without load, but I'm assuming the voltage drop for B+ under load is nothing close to 100V. LM317 resistor values are textbook for a 6.3v output. The 470uF capacitor shouldn't be dropping voltage since it is in parallel, correct? I can just replace R2 with a trimmer to compensate but am curious for more educated minds to help me figure out what's going on. Supply voltage for HI AC is 200 as written on transformer, but closer to 211 measured.
Been working on a DIY Project and built the power supply for it today. It's a bass DI based on the A-Designs REDDI from the GroupDIY forum. Things are a little slow over there, and this issue isn't specific to the project, so I thought I'd ask the question here. I'm getting 288V from the B+ output, and 5.3V from the DC Heater supply. These figures come from measurements without load, but I'm assuming the voltage drop for B+ under load is nothing close to 100V. LM317 resistor values are textbook for a 6.3v output. The 470uF capacitor shouldn't be dropping voltage since it is in parallel, correct? I can just replace R2 with a trimmer to compensate but am curious for more educated minds to help me figure out what's going on. Supply voltage for HI AC is 200 as written on transformer, but closer to 211 measured.