Ramsey Electronics BS1 Instruction Manual - page 14
BS-1
• 14
OK, we’re halfway there. Let’s take care of the audio inputs next. Have you
been following the assembly with the schematic diagram?
30. Install R1, 10K ohm resistor (brown-black-orange).
31. Install R2, 1K ohm potentiometer (3 legs, marked 102).
32. Install R4, 1K ohm resistor (brown-black-red).
33. Install C6, 10 µF electrolytic capacitor. Check orientation.
34. Install R8, 10K ohm resistor (brown-black-orange).
35. Install J2, 3 pin header strip with jumper block.
36. Install C9, .1 µF disc capacitor (marked 104 or .1).
Now is a good time to check our previous work. Take a quick glance at the
board checking for possible solder shorts, cold solder joints, etc. If everything
looks to be in order we can move on to the power supply components.
37. Install D4, 1N4002 diode (black epoxy case with a polarity band). The
band denotes the cathode or negative end of the diode and must be
installed as shown in the parts layout diagram.
38. Install C21, 470 µF electrolytic capacitor. Orientation?
39. Install VR1, 5 volt regulator (3 legged device marked 7805). Make sure
the metal tab is oriented as shown in the parts layout. The text side of the
component should be facing S2.
40. Install C20, 10 µF electrolytic capacitor. Observe polarity.
41. Install D1, 1N4148 diode (small orange glass body with a black band at
one end). Remember, diodes are polarity sensitive and must be oriented
correctly. Check the parts layout diagram for proper orientation of the
banded end.
42. Install D2, 1N4148 diode. Ensure the banded end is oriented correctly.
43. Install D3, 1N4148 diode. Ensure the banded end is oriented as shown
in the parts layout diagram.
44. Install C2, 10 µF electrolytic capacitor. Watch that polarity.
45. Install C3, .1 µF disc capacitor (marked 104 or .1).
The next group of components would best be classified as “ miscellaneous
support components”. This doesn’t mean that they aren’t important, as
without them the BS1 is just a paperweight. Bypass capacitors, pull-up
resistors and a small oscillator comprise this group.
46. Install R11, 10K ohm resistor (brown-black-orange).
47. Install R13, 10K ohm resistor (brown-black-orange).