Preamplifier on the chip KR140UD1B. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Preamplifiers

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Your attention is invited to a preliminary amplifier with a tone block. This amplifier is entry-level, but with its simplicity, its parameters are quite decent.

Main characteristics

We look at the scheme

As mentioned above, the amplifier is assembled on a KR140UD1B chip. The tone control is included in the feedback loop. Resistor R11 is engaged in high-frequency adjustment, and R6 is engaged in low-frequency adjustment. Well, the resistor R10 regulates the level of the output signal.

The amplifier needs a stabilized power supply. The stabilizer can be made in two ways - a parametric stabilizer on zener diodes (1) and a stabilizer on microcircuits (2).

The advantage of the first circuit is that the maximum input voltage is practically unlimited in value - it is enough to choose resistors R1 and R2, while for integrated stabilizers the input voltage should not exceed 30 volts.

Publication: radiokot.ru

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