Ramsey Electronics FZ-146 Specifications download pdf (Page 77)

FX-146 • 77

Stage B: AUDIO AMPLIFIER CIRCUIT ASSEMBLY:

Some of the Stage "A" steps required more detailed explanation than simply

inserting and soldering parts. As we move along, there will be more and

more short "one liners"! The following steps will complete a working audio

amplifier ready to power up and test.

 B1. Install U2, the LM380 IC. Be sure to orient the dotted or banded end

as illustrated. (The use of a DIP socket for U2 is NOT recommended,

even if you use sockets for the other IC's. Notice that most of U2's pins

are soldered to the PC board ground plane. This provides heat sinking

to the IC chip for proper heat dissipation.)

 B2. Install C48, 4.7 or 10 uf electrolytic, observe correct polarity.

Stage B: Receiver Audio Amplifier and Speaker Connection

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Ramsey Electronics FZ-146 Specifications Page 77