1
vote
4answers
390 views
Controlling DC (Pager) Motor with Audio Signal
I'm trying to control a DC (pager) motor with a sound signal so that I can use an audio synthesizer to control the speed of the motor. I'm hoping to modulate the speed of the motor …
0
votes
2answers
98 views
How to get higher frequency from DC power supply?
I desoldered a comp, HY-05 Electro-magnetic sound generator, from a broken motherboard. Its DCV is 3~8V, operating frequency 2400 plus or minus 200 Hz. I can get a small metallic …
5
votes
8answers
405 views
Polyphonic sounds from a microcontroller?
I can make monophonic sounds by toggling a single pin (at a varying rate) connected to a piezo buzzer.
How can I generate two mixed audio signals in software to create polyphony?
…
5
votes
4answers
194 views
Simple (?) pressure activated sound
I'm thinking about putting together something simple for my young son's soccer team. I'd like to build a simple circuit that could be placed on/underneath the laces of their shoes …
9
votes
13answers
445 views
Electronics kits, any requests?
I'm always looking for interesting electronics kits with a music or audio based theme. I've recently started an online shop selling a basic electronics kit, the Posc pocket oscilla …
3
votes
3answers
234 views
How do I detect the pattern of the knock on a door, and use it as a signature to unlock a door?
How do I detect the pattern of the knock on a door, and use it as a signature to unlock a door?
