Combined recording level indicator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Audio equipment
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The combined recording level indicator is designed for high-quality tape recorders. It contains an intermediate level indicator with an integration time of about 80 ms and a measurement range of at least 28 dB, as well as a maximum level indicator that registers short-term excesses of the nominal recording level.
(click to enlarge)
The first indicator consists of a signal amplifier (V1), a rectifier (V2) and a DC amplifier (V4, V6) loaded on a pointer meter P1. The parameters of the V3R6 and V5R7 circuits connected in parallel to it are selected so that the meter scale becomes close to logarithmic. The second indicator is made on the D1 chip and the VS LED. The chip element D1.1 performs the functions of a buffer stage, D1.2, D1.3 form a Schmitt trigger, D1.4 is used as an inverter. When the nominal recording level is exceeded, a logic 1 signal is generated at the trigger output, and a logic 1.4 signal is generated at the output of the inverter D0. As a result, the V8 LED cathode is actually connected to the common wire, and the LED lights up. The voltage at its anode is stabilized by the Zener diode V7.
An M4206 microammeter with a total deflection current of 100 μA and an internal resistance of 200 Ohm is used in the intermediate level indicator.
Setting up the device comes down to calibrating the indicators by selecting resistors R5, R9 and R10.
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