| Megaphone at 9V |
Amplifier for megaphone operating at 9V. |
2.93 |
1,725 |
| IR audio receiver |
Receiver for IR audio modulated signal. |
2.85 |
1,698 |
| Noise generator |
Noise generator using zener diode. |
2.92 |
1,618 |
| Ultrasonic generator |
Generates audio signal from 12 to 50 kHz. |
2.88 |
1,500 |
| Stereo coder |
Stereo coder. |
2.83 |
1,498 |
| Amplifier with TDA738x chip |
Circuit for Car-CD final stage TDA7382 / 83 / 84A / 85 / 86. |
2.85 |
1,453 |
| Two tone siren v1 |
Two tone siren using two NE555 ICs. |
2.92 |
1,354 |
| Ultrasonic receiver |
Ultrasonic audio receiver. |
2.95 |
1,353 |
| Audio message recorder |
Audio message recorder using Information Storage Device - ISD integrated circuit. |
2.94 |
1,336 |
| Two tone siren v2 |
Two-tone siren with CMOS IC 40106. |
2.86 |
1,264 |
| Tremolo effect |
Tremolo audio effect. |
2.86 |
1,230 |
| Morse code practice keyer v1 |
Simple Morse-code practice oscillator. |
2.85 |
1,211 |
| Underwater microphone |
Underwater microphone with TBA820M. |
2.84 |
1,201 |
| RIAA phono amplifier |
RIAA phono amplifier for amplification of signal picked-up with a crystal. |
2.92 |
1,074 |
| Metronome v1 |
Metronome, tick-tick. |
2.89 |
1,071 |
