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Group buy: AF4 Board
Same AF-4 board as a few years back
AF-4 Boards designed by Jens Rasmussen.
Single channel filter board that includes
HP/LP/BP filters 1st to 4th order
Input buffer/Shelving filter
2 Peaking/notch filters
1 first order all pass filter
Output buffer with adjustable attenuation
One board can make a two way filter or a bandpass filter for one channel. Two needed for stereo. Three way requires 2 boards per channel, four way 3 boards per channel.
Requires +/-15V supply
Pcb $7 each at 100 Pieces total, $6 each at 150
Plus priority mail shipping. and paypal fees
I will send a filter design spreadsheet to all purchasers.
I'll appreciate if most people will use Paypal.
If you can't use Paypal for some reason there are other alternatives, please take this in private emails to me.
I will post shipping rates shortly
You can rather safely choose "regular mail" to most places in the world.
Sign up and fill in username, country and number of pcb's but let me add with the rest. You must also send me your email address. I'll send you a Paypal invoice as soon as possible. Change only when you have received the stuff. Right now it's only an interest list with NO OBLIGATIONS.
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