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The following quotation summarizes its facilities: [T]he SN76477 generates complex audio signal waveforms by combining the outputs of a low frequency oscillator, variable frequency (voltage controlled) oscillator (VCO) and noise source, modulating the resulting composite signal with a selected envelope and, finally, adjusting the signal's attack and decay periods.
Low frequency filter: Eliminate the effects of annoying low-frequency record "noise" with this simple circuit. Joseph M. Gorin: 52/11: November 1981 Expanded scale voltmeter: Here's a way for you to add super accuracy to your analog voltmeter. T. J. Byers: 52/11: November 1981 Synthesized RF generator: Part 3. How to complete, calibrate and use ...
The Texas Instruments SN76489 is a programmable sound generator chip from the 1980s, used to create music and sound effects on computers and video game systems. Initially developed by Texas Instruments for its TI-99/4A home computer, it was later updated and widely adopted in systems like the BBC Micro , ColecoVision , IBM PCjr , Sega's Master ...
A real ultra-low power board, capable of running of a single AA. The board counts with an efficient step-up regulator (MCP16251) and can be powered from 0.9 V. The Whisper Node has a built-in RFM69 long-range sub-GHz radio and 4 Mbit flash memory. The board can also run from a standard power supply and use the battery as backup.
Sound from ultrasound is the name given here to the generation of audible sound from modulated ultrasound without using an active receiver. This happens when the modulated ultrasound passes through a nonlinear medium which acts, intentionally or unintentionally, as a demodulator .
Frequency range Wavelength range ITU designation IEEE bands [5] Full name Abbreviation [6] Below 3 Hz >10 5 km — 3–30 Hz 10 5 –10 4 km: Extremely low frequency: ELF — 30–300 Hz 10 4 –10 3 km: Super low frequency: SLF — 300–3000 Hz 10 3 –100 km: Ultra low frequency: ULF — 3–30 kHz 100–10 km: Very low frequency: VLF — 30 ...