|
µC generates musical sounds - 04/15/99 Issue of EDN Many
modern devices send audible signals to their operators to indicate some of
the predetermined conditions or states of the system under control. ...Page
includes several designs. Scroll to find this one.... [Design Idea by
Abel Raynus, Armatron International, Melrose, MA]/ |
|
2-Input Mixer - As simple as it gets. mixer consists of two
transistor-based preAmplifiers. first one (designated "Mike in")
offers higher gain. it works well with a regular dynamic microphone.
second one can be used to control audio input from a tape recorder/CD
player. (added 6/06) |
|
2m-20m Transverter - This little circuit is a transmitting and
receiving converter (transverter) that converts a FT290 or similar multimode
handheld transciever to the 14MHz amateur band. The project is a single
board module that needs an external local oscillator, for example, the VHF
harmonic oscillator (or QRP VHF FM TX) LO for transverter project. It should
be a relatively simple matter of scaling coils.... [from Harry Lythall's
website] |
|
9-Pin PC Serial Port to MIDI Synthesizer Interface Cable -
(circuit / schematic design added 6/06) |
|
|
|
|
Acoustic Simulation Plug-in for Winamp (MP3) Players - A freeware plug-in
called "Speakers Simulator" for the Winamp MP3 player that simulates a natural
soundfield in headphones. The program employs a Fast Fourier Transform (FFT) filter
which is compensated to avoid Comb effects. The crossfeed delay....Designed by
Vladimir Kopjov (Circuit design added 04/05/06) |
|
Add speech encoding/decoding to your design - 02/04/99 Issue of EDN
Adding speech capabilities to a design can sometimes lead to complex algorithms and
expensive DSPs or specialized audio chips. However, with completion of a
simplified adaptive differential pulse-code-modulation (ADPCM]algorithm, you can now
implement se audio capabilities in low-cost 8-bit µCs, which typically….Page includes
several designs. Scroll to find this one....(EDN Design Ideas] [Design
Idea by Rodger Richey, Microchip Technology Inc, Chandler, AZ] |
|
Amiga MIDI Interface - (circuit / schematic design added 6/06) |
|
AN-663: Sound Effects for the COP800 Family - National Semiconductor
Application Note (app note added 2/06) |
|
Analog MIDI Synthesizer - (electronic circuit added 4/05) |
|
AN-H43: HV857 EL Lamp Driver Circuits for Low Audible Noise - Supertex
Semiconductors (app note added 6/06) |
|
ASM 1 Analog Synthesizer Module - (electronic schematic / circuit added
4/02) |
|
Audible Train Approach Warning - This is a circuit that will give an audible
warning that a train is entering a particular section of track. The detector also has
a LED that indicates when a train is entering or leaving the block. [from Rob
Paisley's Model Train web site] |
|
Automatic School Bell - Circuit / schematic (added 02/05) |
|
Birdie Doorbell Ringer - P1 is of experimental value. Start with 220 Ohms or
so and modify to suit your needs. The transistor is a general purpose kind and is not
critical, almost any PNP type will work. L1 is a bell-transformer which is usually
already present in the house. If you wish, you could use a battery instead of the bell
transformer. Just hookup a 9-volt battery (or wall adapter)to points 'A' and 'B' (A=+)
the diode (D1) is to protect the circuit from accidental polarity reversal and is
optional, but required as a rectifier for use with the bell transformer.…. [Tony van
Roon's circuit] |
|
Call Sign Annunciator - (electronic design added 09/06) |
|
Canary Sound Effect (Stepan Novotill) - Reverse engineered circuit diagram
of a commercial Electronic Bird. This one was built into a plastic christmas
ornament and runs off a 9V battery. Note that L1 is actually just an audio transformer
with an unused secondary winding. (added 10/04) [Circuit by Stepan Novotill] |
|
Car Back-up Alarm - The brake lights of automobile trigger this
circuit on and off. This save annoyance of alarm when it is not needed.
This is an older circuit which was published in Popular Electronics Magazine, but
still a good circuit today. (Tony van Roon's electronic design added 6/06) [Tony van
Roon's circuit] |
|
Colour Organ - Three Lamp-Channels Output - Built-in Electret Microphone
(circuit added 12/2009) |
|
Cuckoo sound Generator - This circuit generates a two-tone effect very much
alike the cuckoo sound. It can be used for door-bells or other purposes thanks to a
built-in audio amplifier and loudspeaker. Used as a sound effect generator it
can be connected to external amplifiers, tape recorders etc. In this case, the
built-in audio amplifier and loudspeaker may be omitted and the output taken from C8
and ground.…. |
|
|
