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On/off buffer switches analog or digital signals: 3/30/06 EDN Design
Ideas / (added 11/06) Use an op amp and a dual SPST to switch
signals under digital control. |
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One Transistor Theremin: (electronic schematic / circuit added 4/02) |
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Portable CD Player Adapter for Car: Whenever I'm in the car listening to my
favourite CD, it always happens-my batteries go dead. To solve that problem, I built
this extremely simple regulator circuit. It steps down the 12V from the lighter socket
to 9V which is used by the CD player. Different CD players (I have a Sony Discman) may
require different voltages, so just use the correct regulator. All the 78xx series
regulators have the same pin out, so the circuit is universal. (electronic circuit
added 4/05) |
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PracticeMan(TM): An experimental device intended to be used as a
self-contained musican's tool. Has built-in clean, and overdriven preamps, three-band,
active tone control, and auxiliary outputs to feed your standard amp. (circuit design
added 7/06) |
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PreAmplifier for Microphone or Guitar Use: suitable for guitar or microphone
use. (added 6/06) |
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Precision Metronome and Pitch generator: Precision Frequency generator 1 to
999 Hz. Precision Metronome 1 to 999 beats per minute (added 3/05) |
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Serial Port to MIDI Synthesizer Interface Cable: (circuit / schematic design
added 1/07) |
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Song Number Display: (electronic Circuit / Schematic added 10/04) |
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Spring Reverb Unit for Guitar: (electronic circuit added 4/05) |
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Spring Reverb Unit: (electronic circuit added 7/03) |
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Spring Reverb: (electronic circuit added 4/05) |
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Stage Center Reverb Unit: Simple spring reverb unit... (circuit design added
7/06) |
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Timer Remembers Your Rhythm: 01/05/95 EDN-Design Ideas / (added 6/06) |
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Tone Display System: This device gives visual feedback of which note you're
playing, so you can set up the note before bringing up the volume to sound it. It
features a 40-LED display, for over three octaves of range at any given time.
Furthermore, a three-position switch extends the range by two octaves, for a total
usable range of over five octaves. (added 7/03) |
