errba said:
Can i just substitute any polystyrene filter capacitor that matches the same capacitance in the schematic? I found some that have a lower voltage than the ones justradios offers and there local to the US, being more conventient for me.
It should be fine as long as the operation specs are above 48v for phantom power correct?
Also in regards to biasing the jfets, am i right to assume i can just use a sine wave generator output through my audio interface and then using an xlr cable connceted to the microphone receive the input signal through a software scope or is it necessary to have the mic unplugged? I'm not very familiar with using analogue oscilloscopes if someone can point me in the right direction i'd be greatful..
Hi errba (in tha' club get tipsy),
re: the polystyrenes, yes if the fit is ok.
re: bias, yes you can use a 1k sine wave test tone from the computer, so long as you have enough juice to drive it into clipping. One thought though, you will need to send the signal, then separately be receiving it for analysis so i dunno.
For the 1k send, if you can break it out to tip and sleeve, you can easily use a switchcraft 11 or 11a female jack to have easy clip points to inject the signal.
You will need to power the microphone to check the bias, though the transformer doesn't have to be in circuit.
If you can access a scope, I can help you with the settings.
To detail a super simple set up that I mentioned a few posts back.
synthesizer set to a 1k sine tone-> some boost pedal or pre (to get into clipping territory, start low on the volume)-> 1/4 cable plugged into floating switchcraft 11 female jack-> two clip leads for (+) and (-) -> documented injection points.
If you can set this up, then you can receive via the xlr and perhaps (I don't own or know about software scopes, but assuming you can see the wave form in your computer) visually bias and hear it at the same time.
I realize having typed this that it may read scatterbrained-y
