Ramsey Electronics FM100B Instruction Manual page 23

15B. Install D3, one of the 1N4148 diodes. This is identified by not only the
text on the diode, but also by the orange glass body with one black stripe
on the end. Yes, this is the correct position on the board for D3! Install the
diode in the same orientation as shown in the Parts Layout Diagram.
Diodes only conduct in one direction so make sure to install it correctly!
16B. Install D4, another 1N4148 type diode. Again check orientation!
17B. Install Q5, a 2N3904 NPN transistor. These look very much like the
BS170, so you will need to identify them by the text on the flat side. Install
in the same orientation as shown with the flat side as reference.
18B. Install Q2, a BS170 JFET transistor. Again use the flat side for
installation orientation.
19B. Install C20, a 1 uF electrolytic capacitor. Watch your polarity by
making sure the stripe indicating the negative side of the capacitor is not
inserted in the hole marked with the positive sign on the PC board.
20B. Install C113, 10 uF electrolytic capacitor. Remember to watch the
polarity!
21B. Install C19, a 10 uF electrolytic capacitor. Polarity!
22B. Install C40, a 10 uF electrolytic capacitor.
23B. Install C22, a 10 uF electrolytic capacitor.
24B. Install C25, a 10 uF electrolytic capacitor.
25B. Install C14, a 10 uF electrolytic capacitor.
26B. Install C112, a 22uF electrolytic capacitor.
27B. Install U13, LMC662CN CMOS Dual operational amplifier IC. Again,
be sure it is seated flush with the PC board before soldering all leads.
28B. Install C26, a 0.01 uF ceramic capacitor (marked 103).
29B. Install C41, another 0.01 uF ceramic capacitor (marked 103).
30B. Install C110, a 10uF electrolytic capacitor. Remember to watch
polarity.
We will hold off on the installation of R16 and J5 until later (these will just get
in the way while we put together the rest of the board). In the mean time this
completes the microphone section. Before we continue we should check over
the part orientation for your diodes, capacitors, the IC, and the transistors. If
we check in small sections it will be easier to find mistakes.
FM100B • 23