Simple Mixer with 4 Input

Here the simple mixer with 4 input and 2 op-amps:

Simple Mixer with 4 Input Circuit diagram :

A basic mixer suitable for mixing microphones or even effects outputs. The overall gain from input to output is one if the pot related towards the input is full up. You can make this a net gain of ten (or any other reasonable gain) by reducing the input resistor towards the second op amp. 10K in this position gives a gain of ten, or 20db. In case you are mixing effects outputs that have an output level control constructed into them, you are able to dispense using the input level controls, or make some have level controls, some not. Audio taper pots are possibly much better, but linear will do the job.

For the op amps, choose a JFET input dual or singles, such as from the National Semi LF3xx series, or something such as the TL072 or TL082.

 

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74LS192 Computer controller 4 DC motors

This circuit has proven useful when interfacing my computer to home made robotics. It is easy to build and use and it can control two DC motors of any current or voltage rating, depending on the rating of the relays. The circuit also provides two shaft encoders for positional feedback to the computer.

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4 x 50 W multifunction quad power amplifier with built in diagnostics feature

Features:

■ Multipower BCD technology

■ MOSFET output power stage

■ DMOS power output

■ New high efficiency (class SB)

■ High output power capability 4 x 28 W / 4  @ 

14.4 V, 1 kHz, 10 % THD, 4 x 50 W max power 

■ Max. output power 4 x 72 W / 2 

■ Full I2C bus driving:

– Standby

– Independent front/rear soft play/mute

– Selectable gain 30 dB / 16 dB (for low noise 

line output function)

– High efficiency enable/disable

– I2C bus digital diagnostics (including DC 

and AC load detection)

■ Full fault protection

■ DC offset detection

■ Four independent short circuit protection

■ Clipping detector pin with selectable threshold 

(2 % / 10 %)

■ Standby/mute pin

■ Linear thermal shutdown with multiple thermal 

warning

■ ESD protection

Description:

The TDA7563B is a new BCD technology quad bridge type of car radio amplifier in Flexiwatt27 & PowerSO36 packages specially intended for car radio applications. Thanks to the DMOS output stage the TDA7563B has a very low distortion allowing a clear powerful sound. Among the features, its superior efficiency performance coming from the internal exclusive structure, makes it the most suitable device to simplify the thermal management in high power sets. The dissipated output power under average listening condition is in fact reduced up to 50 % when compared to the level provided by conventional class AB solutions.

This device is equipped with a full diagnostics array that communicates the status of each  speaker through the I2C bus.

Circuit Diagram:

4 x 50 W multifunction quad power amplifier  with built-in diagnostics feature

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4 x 11 W single ended or 2 x 22 W power amplifier with distortion detector

GENERAL DESCRIPTION

The TDA1555Q is an integrated class-B output amplifier in a 17-lead single-in-line (SIL) plastic power package. The circuit contains 4 x 11 W single-ended or 2 x 22 W bridge amplifiers. The device is primarily developed for car radio applications.

Features

• Requires very few external components
• Flexibility in use − Quad single-ended or stereo BTL
• High output power
• Low offset voltage at outputs (important for BTL)
• Fixed gain
• Good ripple rejection
• Mute/stand-by switch
• Load dump protection
• AC and DC short-circuit-safe to ground and VP
• Thermally protected
• Reverse polarity safe
• Capability to handle high energy on outputs (VP = 0 V)
• Protected against electrostatic discharge
• No switch-on/switch-off plop
• Low thermal resistance
• Identical inputs (inverting and non-inverting)
• Flexible leads
• Distortion detector

Circuit Diagram:

TDA1555Q 4 x 11 W single-ended 

TDA1555Q 2 x 22 W power amplifier with distortion detector

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4 Bit Analogue to Digital Converter

The operation of the converter is based on the weighted adding and transferring of the analogue input levels and the digital output levels. It consists of comparators and resistors. In theory, the number of bits is unlimited, but each bit needs a comparator and several coupling resistors. The diagram shows a 4-bit version. The value of the resistors must meet the following criteria:

• R1:R2 = 1:2;
• R3:R4:R5 = 1:2:4;
• R6:R7:R8:R9 = 1:2:4:8.

The linearity of the converter depends on the degree of precision of the value of the resistors with respect to the resolution of the converter, and on the accuracy of the threshold voltage of the comparators. This threshold level must be equal, or nearly so, to half the supply voltage. Moreover, the comparators must have as low an output resistance as possible and as high an input resistance with respect to the load resistors as feasible. Any deviation from these requirements affects the linearity of the converter adversely.

4-Bit Analogue to Digital Converter Circuit Diagram

If the value of the resistors is not too low, the use of inverters with an FET (field-effect transistor) input leads to a near-ideal situation. In the present converter, complementary metal-oxide semiconductor (CMOS) inverters are used, which, in spite of their low gain, give a reasonably good performance. If standard comparators are used, take into account the output voltage range and make sure that the potential at their non-inverting inputs is set to half the supply voltage. If high accuracy is a must, comparators Type TLC3074 or similar should be used. This type has a totem-pole output. The non-inverting inputs should be interlinked and connected to the tap of a a divider consisting of two 10 kΩ resistors across the supply lines. It is essential that the converter is driven by a low-resistance source. If necessary, this can be arranged via a suitable op amp input buffer. The converter draws a current not exceeding 5 mA.

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Audio IC TDA1013 4 5W

Circuit diagram IC TDA1013 4.5W:

Audio IC TDA1013 4.5W

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4 Channel Audio Mixer Circuit Diagram

A 4 channel audio mixer that requires very few electronic components can be built using this electronic scheme based on SSM2024 chip. To obtain a small offset and a high rejection, the four inputs of the 4 channel audio mixer circuit must have an impedance of 200 ohms to the ground. These impedances are resistances obtained with R5-R8, which are part of the voltage divider at each input. With values of the components from this scheme nominal input signal is 1 V (0 dBV). At this level, distortions are about 1%, and at lower levels do not exceed 0.3%. Maximum amplification is obtained for a control current of 500 uA, in which case the input control voltage is slightly increased to 0.5 V (result we need a maximum control voltage of 5.5 V). The amplifier output currents are summed by simply connecting the output pins. The signal / noise of the mixer is about 90 dB and the bandwidth of the order of 130 kHz. SSM2024 integrative work satisfactorily with a supply voltage between 9 V and 18 V, but best results are obtained at ± 15 V.

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