Digital scale for superheterodyne type FM receivers on microcircuits: SHA1191, SHA1238, TEA5711, TA8127, TA8164, TA8167, etc. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / radio reception
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Main Specifications
Upit. ................................................. ....12 V
Icont.................................................. ......100 mA
Displayed frequency range ..... 88 - 108 MHz
Purpose and device
The digital scale is intended for use in conjunction with superheterodyne-type FM receivers based on ICs SHA1191, SHA1238, TA2003, TA8127, TA8164, TA8167, TEA5711, etc. (except for K174XA34, A7021, TDA7021, TDA7088, KA22429). The device consists of a microwave amplifier (emitter follower), digital and indicator units. The digital and indicator blocks are connected by flexible wires, which makes it possible to conveniently place the scale anywhere in the structure.
connection
The digital scale amplifier is soldered with a pin to the tuner board directly at the connection point of the local oscillator circuit with the tuner chip: CXA1191-(pin 7), CXA1238-(pin 22), TA8127-(pin 21), TA8164-(pin 13), TA8167-(pin 21), TEA5711-(pin 23). At the same time, due to the introduction of additional amplifier capacitance, a slight shift in the FM band is possible. To return to its original state, it is necessary (based on the scale readings) to slightly stretch the turns of the heterodyne coil.
Note: when powering the device with a voltage of less than 10 V (to increase the brightness of the indicators), you can short-circuit the 22 Ohm ballast resistor.
Publication: cxem.net
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