rascalseven
Well-known member
Hi,
Below is a drawing I made of the 5kHz boost portion of the Pultec EQP-1R filter design.
Instead of the 1A's multitap inductor, the 1R's hi-boost section uses two separate inductors (50mH and 100mH) in various series and parallel configurations to achieve different inductances for the five different frequency choices.
I understand that in series these make 150mH and in parallel they make 33.3mH, but I don't undertand the 5k setting. Can someone show me how to calculate what the straight wire (red in the drawing) in parallel with the 50mH inductor does to the overall inductance? Without the wire it would be 150mH, but with it.......????
Thanks so much.
Peace,
JC
Below is a drawing I made of the 5kHz boost portion of the Pultec EQP-1R filter design.
![EQP1R_5k.gif](https://proxy.imagearchive.com/ad6/ad660ae8b339a9db8ed8a1d90eb548ec.gif)
Instead of the 1A's multitap inductor, the 1R's hi-boost section uses two separate inductors (50mH and 100mH) in various series and parallel configurations to achieve different inductances for the five different frequency choices.
I understand that in series these make 150mH and in parallel they make 33.3mH, but I don't undertand the 5k setting. Can someone show me how to calculate what the straight wire (red in the drawing) in parallel with the 50mH inductor does to the overall inductance? Without the wire it would be 150mH, but with it.......????
Thanks so much.
Peace,
JC