Recent content by JMK

Hi essenmein, Thanks for your message. Yes this is for a Pultec EQP-1A replica, i do also have a very soft spot for vintage audio gear I love the sound on some of the original units, but looking for tweaks that would make it even better. I do have some info on the original coil, but i have...

This is true, great idea. Wish i had an oscilloscope, i should get one in the future, that would be more accurate and easier :)

Okay i see. This is what i have available on the LCR meter100Hz/120Hz/1kHz/10kHz /100kHz I do actually have a function signal generator 1Hz-500kHz and a standard DMM, but i would only be able to measure 60-50Hz AC on this DMM, so that would be insufficient, it would need to be 100kHz AC as i...

Thank you! I think i get it now, i should measure L at lowest test frequency possible, where i would get a reading of course. this is L1, f1. I should then measure L at highest frequency possible. The reading i get at a higher frequency would be lower, because the parasitic capacitance is...

Okay i see thanks for the tips, and thank you for taking the time to clear this up for me. Kind regards

Hi Baluncore, Thank you very much for the reply. Very good explanation you provided, the best permeability for this circuit using an MPP core would be 125u then. I am still pretty new to this, the LCR meter i am using is called DE 5000. The test frequencies it can provide is 100 / 120 / 1k / 10k...

Hi, The thing is that i want to wind a multi-tapped toroid inductor for the this circuit (see picture at the bottom) Using an MPP core. What i am confused about is this. On the following table you can see that when the permeability of an MPP core increases the high frequencies it can handle...

Very very useful information Tom. Thank you very much for this, really clears it up for me. All the best

Hi Tom, Thank you very much for your reply. Yes i would just do it on the switch of course. Do you have any tips on how to wind this type of inductor? I know that its best to wind this in a linear pattern but when i am done with let's say 195 turns, should i then glue the end so its tight, or...

Hi, I am going to wind an tapped toroid inductor for a LCR circuit in an equalizer. I have calculated the number of turns I need for each winding. This is my first time winding an inductor so I need to get some things straight. What to do with the 10 kHz tap, should I twist a wire with the 12...