3 RF alignment coil

In general, the RF amplifier gain and fluctuations in the effective sensibility should be kept as low as possible.

19. IF Count Buffer

Although this explanation is for the LA1137N, it is identical for the LA1136N, except that the pin numbers are different.

Circuit operations

Pin 13 serves as both the count buffer input pin and output pin. When the control voltage with no load is HIGH 5 V, the IF buffer

output is 300 mVrms and when LOW GND, 1 mVrms or lower. Supports Sanyo’s LM7000 and LC7230.

Turns

proportional

to gain

Maximum sensitivity MS

Increase turns

Effective sensitivity QS

Number of turns

Check the data in the diagram to determine the number of

turns.

IF counter

amplifier

Reverse

circuit

IF buffer

Control

voltage

LA1136N, 1136NM, 1137N, 1137NM

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