RS-Timbre: Hex-Amp Power-Output PUBLIC

Power-Amps of RS-Timbre: Hex-Amp System

Power-amps of a Hex-Amp System for 6-string electric guitar. Two amplifier circuits shown. Uses one 2-channel audio amplifier IC. Six amplifiers are required, using three of the same ICs, with circuits identical to this except for input and amplifier labels. The IC is the Texas Instruments LM4766T/NOPB 2-channel 40-watt audio amplifier IC available from DigiKey for $7.11 ea. DigiKey # LM4766T/NOPG-ND. Though rated for up to 40-watts, each amplifier is configured here to provide only 12W RMS maximum for an 8-ohm minimum speaker-load. Example speaker cited at lower right in diagram. Six of these circuits are required, installed in one 6x8 cabinet,or three 2x8 cabinets or six 1x8 cabinets (6x8 is recommended), though each speaker must have its own connecting means and separate dedicated wiring. A purpose-designed power-supply circuit for this project is shown here at CircuitLab. Experimental Circuitry! Fully breadboard test before committing to a soldered build. House the power-amp circuits in a grounded metal enclosure and isolate the power transformer from the rest of the circuitry. See also the complete Hex-Amp System under "Amplifiers" at https://kurtusrichtersblog.com (scroll to bottom of Amplifiers pages in the blog). For the Full-Mix signal, a separate monaural power-amp is required (not one of these circuits), either a self-powered PA speaker or a guitar amplifier, rated >= 75 W RMS, in addition to the guitarist's normal rig (which must also be rated >= 75 W RMS). Listening tests will be needed to get desired mix of SPL levels from all amplifiers.