Val_r
Well-known member
I am designing a Pultec MEQ5-style EQ, with a 2/3 H inductance in the low section (45 to 300Hz). What if I used a filter choke as the main inductor?
Any advice?
Thanks,
Val
:?:
Any advice?
Thanks,
Val
:?:
Filter chokes as audio inductors?
- Thread starter Val_r
- Start date
Help Support GroupDIY Audio Forum:
You could, if you can find a filter inductor that high (that hasn't too high a stray capacitance)
What Jake said plus if it's non torroidal, you may have more hum pickup as torroids cancel hum better. But if your hum enviro is not harsh, you might not care. A shield might help if you do experience hum.
NewYorkDave
Well-known member
Wilco makes a 2H toroid with low DCR. It might be hard to get in Europe, though.
http://www.wilcocorp.com/catalog/series.cfm?series=HFT
http://www.wilcocorp.com/catalog/series.cfm?series=HFT
bcarso
Well-known member
Also if you have a hum problem try orienting the inductor to null it out. This will usually work for your unit in isolation at least, but may lead to problems if you rack it near other field-emitting units.
> What if I used a filter choke as the main inductor?
Inductance goes down as current increases. Power-filter chokes are rated for a certain inductance AT a certain current. That current is usually much higher than anything we use in signal paths.
No good way to estimate the low-level inductance from the power-rated inductance. Low-level H might be 1.1 times higher or 3 times higher.
Buy a little small, measure it at typical signal level.
Inductance goes down as current increases. Power-filter chokes are rated for a certain inductance AT a certain current. That current is usually much higher than anything we use in signal paths.
No good way to estimate the low-level inductance from the power-rated inductance. Low-level H might be 1.1 times higher or 3 times higher.
Buy a little small, measure it at typical signal level.
Val_r
Well-known member
Hammond has some open and encapsulated power chokes, very easy to find. Some are rated 3H/100mA/86ohms, or 2.2H/50mA/305ohms, or better 4H/50mA/300ohms.
Allowing the use of paper-in-oil caps.
Did anyone use the metallized teflon caps produced by SCR (A French company)?
the link for the chokes is:
http://www.hammondmfg.com/pdf/5c0034.pdf
Thanks,
Val
:idea:
Allowing the use of paper-in-oil caps.
Did anyone use the metallized teflon caps produced by SCR (A French company)?
the link for the chokes is:
http://www.hammondmfg.com/pdf/5c0034.pdf
Thanks,
Val
:idea:
