Ramsey Electronics FR6 User Manual download pdf (Page 16)

FR6 • 16

❒ 70. Install C19, 22 pF.

❒ 71. Install Y1, the 10.24 MHz. crystal. No special procedure is required.

Simply press the crystal firmly into its holes as far as it will go, and make

good solder connections.

❒ 72. Install FL2, the 450 KHz filter. Its three leads are delicate and fit in

only one way.

❒ 73. Install C23, .001 uF [marked .001, 102, or 1 nF].

❒ 74. Install C27, 1 uF electrolytic, observe correct polarity.

❒ 75. Install D2, the 1N4148 signal diode, observe correct orientation of the

banded cathode end. Be sure you correctly identified D2 and did not

confuse it with the varactor diode already installed.

❒ 76. Install R16, 100K ohms [brown-black-yellow].

❒ 77. Install R15, 470K ohms [yellow-violet-yellow].

5. FINAL CONNECTIONS: THE LM386 AUDIO IC STAGE

You now have a working FM receiver ready for adjustment. The output of the

MC3359 FM IC simply needs to be boosted to listening level. A few more

connections, and your receiver will be ready for adjustment and testing! Now

would be a good time to review some of your previous work and also to make

sure you have on hand what you'll need for testing: antenna, fresh battery,

earphone or speaker with correct plug or adapter.

❒ 78. Review the instructions for installing U1 and U2. Insert the LM386 IC

(U3) with the band or dot oriented correctly. Solder the 8 connections.

❒ 79. Install C32, a 100 to 220 uF electrolytic, observe correct polarity.

❒ 80. Install C31, .01 uF (marked .01, 103, or 10 nF).

❒ 81. Install C36, 4.7 or 10 uF electrolytic, observe polarity.

❒ 82. Install C33, 100 to 220 uF electrolytic, observe polarity.

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Ramsey Electronics FR6 User Manual Page 16