LM368 Audio Amplifier

This circuit is for low voltage applications requiring high power outputs. Output power levels of LO W into 4 ohm from 6 V and 3 V into 8 ohm from 12 V are typical. Coupling capacitors are not necessary since the output

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CA3140 Audio Amplifier

A CA3140 drives a complementary output stage Ql, Q2, and Q3. Output power depends on supply voltage and limits on dissipations of Q2 and Q3, but it can be 1 or 2 W with a higher impedance speaker and a 30-V supply. 

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HA-510X Auto-zeroing-scale

Electronic scales have come into wide use and the HA-510X, as a very low noise device, can improve such designs. This circuit uses a staingauge sensing element as part of a resistive Wienbridge. An auto-zero circuit is also incorporated into this design

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Auto gain control op-amp circuit

An audio signal applied to VI is passed through the operational amplifier 741, U2. After being amplified, the output signal V2 is sampled and applied to a negative voltage doubler / rectifier circuit composed of diodes CRI and CR2, with the capacitor

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BC550 Universal Audio Amplifier

A line amplifier is always a useful unit to have around, whether it is for matching a line signal or raising its level somewhat. This might be needed during a recording session or with a public-address system. Furthermore, a line mixer can be

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NPD8301 FET Audio Amplifier

The excellent characteristics for the track NPD8301 over its range of bias current, thereby improving common mode rejection. The monolithic double NPD8301 offers an ideal low offset buffer function LM10lA low drift op amp.

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