I’m still out of town extra

I received some good stuff via the tips line while I’ve been making an extra stop after Shmoocon. I spent the day helping my less project endowed family run some new wiring (and made some awesome sparks in the process.)

[Damian] sent in his customized version of the classic Atari 2600 adventure game.
[iraqiGeek] sent in his efforts to use the six-axis controller. He used lib-usb and PPJoy to create his own app.

[HP Friedrichs] sent in this interesting post on building military style power supplies. Good stuff if you’re into building your own gear and like interesting chassis designs.

[John] sent in his version of the new KITT’s light bar. (You know you watched it.)

Got something good to share? Use the tips line.

Flat response microphone and amplifier

flat response microphone

Pete (AC7ZL) wrote in to tell us about his latest project: building a flat response microphone and channel amplifier. You may remember his previous project: building a crystal radio from modern junk. Sounds are “colored” by their surroundings; things like furniture, wall coverings, drapes and building materials all affect the way something sounds. To measure the effect that a space has on sound you need a microphone with a flat frequency response. The core element of Pete’s mic is a modified Panasonic WM61A condenser capsule. He rewired it so that it had a broader dynamic range and could handle a higher SPL at the cost of reduced gain. To boost the signal to a usable level he built a preamp with three stages of amplification. He’s got schematics and a more detailed description on the site.

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Crystal radio built from modern junk

crystal radio

[h. p. friedrichs] (AC7ZL) has some great plans for building a crystal radio. The stator coil and output coil are wrapped around the outside of a CDR sleeve. The tuning capacitor is constructed by sandwich two clear CDs between metal and attaching this inside the top of the sleeve. The rotor shaft is mounted using the bushings from a pair of disassembled potentiometers. A hot needle is used to tap the stator coil through the housing every fifth turn. Even though the parts aren’t very traditional it looks like a really solid radio. He’s got instructions for building a matching ear piece out of tea tins too.

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