The PCB contains header for 4 power filter circuits (whats are optional if not required) for 4 dual operational amplifiers. The headphone output can be 6.3mm jack only. The input and line output connectors can be 6.3mm jack OR stereo RCA connector. The input connector must be soldered to the bottom of PCB (blue) and the volume must be potentiometers soldered to the top (yellow) of PCB. The device contains 4 audio inputs with volume adjustment. The new design contains PCB transformer, dual +/- 15V power supply, 4 channel mixer without preamplifiers, unbalanced/balanced converters, and line output with level adjustment. Now I made same design but with 4 inputs and one line output. I already have schematic and PCB design with TPA6120 chip with 2 inputs. I am not decided yet what will the poweramp on the top case of my guitar combo: The PWM chip is better than older solutions if I have speaker cabinet with 4 Ohm or less. I found these solutions if I want to use PWM amplifier. With smaller impedance with paralleled outputs on 1% distortion: This is same as TDA bridged amplifier but on 8 Ohm impedance. 1% distortion, the possible power will much smaller, the chip cannot be paralleled:
The another reason, is, function generator chips are not available on Multisim. This is the reason, why I seek discreet analog function generator for triangle output. I have no experiences with these function generator chips, so I don't know about the output quality. The maximum frequency on the datasheet is 0.5MHz, typical is 1MHz, but the 8038 have 300kHz maximum. These chips are very simple solutions for triangle output, maybe I will try some of them. One of them is LM566 (with this chip I found a schematic) not available here and now, or we can use XR2206 or ICL8038 chips. For this frequency, not too easy to find triangle signal generator with very good output.Ĭan be found one-chip function generators. The clock of PWM input TAS chip is 192-384 kHz, what is understandable if digital chips placed before chip. In this post, I writing about the method and simulation of analog PWM modulator.įirst I need a triangle function generator. I don't think that this solution is ideal for instrument amplification. These chips recommended for home DVD players, the power supply is 3.3 volts only.
For this design required TAS55xx PWM modulators and analog/digital converters. with this package we have one paralleled mono or one stereo poweramp with analog input.īut I have TAS5261 chips, without analog input. This chip have analog inputs, the package contains all required parts (A/D converter, PWM modulator), and the parallel mode is possible if less than 4 Ohm output impedance required.
Newly detected TAS5630 chip can solve my problems about the PWM amplifier.