Ramsey Electronics FR1 Assembly And Instruction Manual - page 11
FR-1 • 11
52. Install jumper JMP3.
How about another break? Everything is done except for the demodulator section.
The front-end is bringing in the signal, the IF amp and filter are amplifying the
converted intermediate frequency signal and the audio amplifier is waiting to drive a
speaker. The only thing missing is a demodulated audio signal to amplify.
53. Install C9, 4.7 or 10 uf electrolytic capacitor. Observe polarity.
54. Install C23, .01 uf disc capacitor (marked .01 or 103 or 10 nf).
55. Install R7, 10K ohm (brown-black-orange).
56. Install R14, 10K ohm (brown-black-orange). Note that R9 is not
installed yet - we'll do that in: 'ALIGNMENT', step #9.
57. Install C2, .01 uf disc capacitor (marked .01 or 103 or 10 nf).
58. Install U1, the ULN2111 FM demodulator chip. Since this chip has 14
pins, be especially careful not to bend any pins under as you insert it into
the PC board. When you solder the chip, verify that you are soldering all
14 pins.
59. Install R1, 4.7K ohm (yellow-violet-red).
60. Install C1, 4.7 pf disc capacitor.
61. Install C3 and C29, both .01 uf disc capacitors
(marked .01 or 103 or 10
nf).
62. Install L2, the shielded metal Quadrature coil. Notice that it will only go
into the PC board one way.
63.
Install the 9 volt battery clamp. Use a scrap component lead wire looped
through the holes in the clamp and into the holes in the PC board. Solder the
wire to the clamp but don't use too much solder as this will prevent you from
seating the battery fully into the clamp.
64. Install the 9 volt battery snap connector. Make sure you put the right
color wire into the proper hole on the PC board.
Hey, all done and ready to listen to tunes from our radio... Well, at least we're
ready to test and align it - then we'll listen to our tunes!