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ActiveFilter Design
Links for the Hi-Fi Speaker Enthusiast:
Single Full Range Speaker Design

Prototype Boards & Software
    Olimex, in Bulgaria, offers fast turn around on prototype boards. While their panel sizes are fixed, they panelize and depanelize (to rectangular cutouts only) for free so you get as many boards as will fit their standard panel size. The boards include component side silkscreen and component side/solder side soldermasks. Their standard panels are 0.062" but they will supply 0.031" for $5 extra.

    3-5 working days for prototypes with solder mask and component print.

    Click here to get all information!

  • PCB Heaven - Electronic designs and schematics, tools and a forum for your projectlog!
    PCB Heaven - Electronic designs and schematics, tools and a forum for your projectlog! - Click here to connect

  • Free PCB routing and schematic capture software

    Click here to get your free copy!

    French language only!

  • Score Schematic Capture for Windows

    Click here for your free copy

  • EAGLE Layout Editor for Windows or Linux

    CadSoft offers user friendly, powerful and affordable solutions for PCB design, including Schematic Capture, Board Layout, and Autorouter.
    You can test drive EAGLE with a Freeware version!

    Click here for Eagle Freeware

  • Oscilloscope for Windows

    Windows application that converts your PC into a powerful dual-trace oscilloscope. Oscilloscope is free for personal use. Software written by Konstantin Zeldovich.

    Click here for Oscilloscope for Windows

  • Free Borland Software

    The Borland C++ Compiler 5.5 Free download.
    Also, free Turbo Debugger

Antique Radio Schematics and Capacitors
  • JustRadios is specialized in antique radio schematics and capacitors (high voltage film, electrolytic, silver mica, ceramic disc and safety capacitors) for old vintage tube radios. They carry antique radio schematic diagrams and electronic circuit service information for American, Canadian and European antique radios.
    Other services: Vintage CB Radio Schematics, Vintage Amplifier Schematics, Transistor Radio Schematics, old Car Radio Schematics and old TV Schematics.