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This circuit is utilized in high-quality stereo cassette decks that operate from either an AC line or battery power. It features a meter rectifier bridge integrated into the feedback loop of an operational amplifier (op-amp), which allows for highly linear AC to DC conversion. This design ensures a flat frequency and amplitude response, along with a rapid voltage rise time, all while maintaining low production costs. Additional information on the circuit operation can be found in the article by J. L. Linsley Hood titled "Low-Noise, Low-Cost Cassette Deck," published in Wireless World, with parts released in May, June, and August of 1976.

The described circuit serves as a critical component in high-fidelity audio applications, particularly in stereo cassette decks. The operational amplifier's feedback loop configuration with the meter rectifier bridge enhances the accuracy of the AC to DC conversion process, making it suitable for audio signals that require high linearity and minimal distortion. The circuit's ability to maintain a flat frequency response ensures that the audio quality remains consistent across the audible spectrum, which is essential for delivering a true-to-source playback experience.

The rapid voltage rise time is particularly advantageous in audio applications, where transient signals are common. This characteristic helps to prevent clipping and distortion during peak audio levels, thereby preserving the integrity of the sound. The choice of components in this design is crucial for achieving the desired performance metrics while keeping costs low, making it a practical solution for manufacturers aiming to produce high-quality audio equipment at competitive prices.

The referenced article provides further insights into the complete circuitry of the cassette deck, detailing the operational principles and additional configurations that can enhance performance. It serves as a valuable resource for engineers and designers looking to understand the intricacies of low-noise, cost-effective audio systems. The comprehensive discussion within the article outlines various circuit implementations and their respective benefits, contributing to a deeper understanding of audio electronics design.Used in high-quality stereo cassette deck operating from AC line or battery. Meter rectifier bridge is in feedback loop of opamp, to give highly linear AC/DC conversion with flat frequency/amplitude response and short voltage rise time at low cost.

Article gives all other circuits of cassette deck and describes operation in detaiL-J. L. Linsley Hood, Low-Noise, Low-Cost Cassette Deck, Wireless World, Part 1-May 1976, p 36-40 (Part 2-June 1976, p 62-66; Part 3-Aug. 1976, p 55-56).

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