Ramsey Electronics FR1 Assembly And Instruction Manual page 10

31. Install C5, .001 uf disc capacitor (marked .001 or 102 or 1 nf).
Time for another break. We've now assembled the whole 'front-end' of our
receiver. Front-end means the beginning of a receiver up to where it converts
to the IF (Intermediate Frequency).
32. Install C25, .1 uf disc capacitor (marked .1 or 104).
33. Install R19, 2 ohm (red-black-gold)
34. Install U2, the LM386 audio amplifier IC chip. The LM386 is a very
popular part, and with good reason. Tucked inside that little plastic body
are about twenty transistors that take a feeble audio signal and amplify it
up to room filling volume!
35. Install C10 and C13, both 100 to 220 uf electrolytic capacitors,
remembering to observe proper polarity of both.
36. Install C16 and C24, both .01 uf disc capacitors (marked .01 or 103 or
10 nf).
37. Install R3, 270 ohm resistor (red-violet-brown).
38. Install Jumper JMP2 using a scrap component lead.
39. Install C18, .01 uf disc capacitor (marked .01 or 103 or 10 nf).
40. Install FL1, the 10.7 Mhz ceramic IF filter. This part looks like a disc
capacitor but has three leads. Amazingly, its function is equal to a small
handful of inductors and capacitors hooked up in a bandpass filter
configuration. For those techno-types, its bandwidth is 280 KHz centered
at 10.7 Mhz with an insertion loss of only 6 dB.
41. Install Q1, a 2N3904 type. Watch placement of its flat side.
42. Install R4, 47K ohm (yellow-violet-orange)
43. Install R2, 1K ohm (brown-black-red)
44. Install C28, .01 uf disc capacitor (marked .01 or 103 or 10 nf).
45. Install jumpers JMP4 and JMP5.
46. Install Q3, 2N3904 transistor. Observe flat side orientation.
47. Install R18, 1K ohm (brown-black-red).
48. Install C22, 4.7 or 10 uf electrolytic capacitor. Watch polarity.
49. Install jumper JMP6.
50. Install resistor R6, 470 ohm (yellow-violet-brown)
51. Install C7 and C8, both .01 uf disc capacitors (marked .01 or 103 or 10
nf).
FR-1 • 10