E11 Lab #3 PCB Construction 2007
This section of the lab will be done in Hicks 310 with the help of Ed Jaoudi.
If you have not soldered before, read my page on soldering technique.
Schematic and Layout:
Procedure
Step 1 - power: Put resistor R1 (violet green brown - 750 Ω) into the board and solder it. Cut off the excess leads. Repeat with capacitor C1 (10 μF). This capacitor is polarized, put the negative lead into the hole with the square pads. Connect the LED, L1. The cathode (the shorter lead) goes into the hold with the square pads - note also that the LED has a flat on one side that should line up with the flat marked on the PCB. Color choice is not important. Solder and cut off the excess leads. Connect the battery holder at J1. Screw the battery holder to the PCB with at least one screw. Put a battery in. LED L1 should turn on. If this happens, move on - if not identify and fix the problem. Remove the battery.
Step 1 - power:
Step 2 - low frequency oscillator: (blinky) Put resistor R3 (brown black yellow - 100 KΩ) into the board and solder it. Cut off the excess leads. Repeat with resistors R2 (brown black orange - 10 KΩ), and R5 (violet green brown - 750 Ω). Put in potentiometer R4 (100 KΩ). Solder and cut off the excess leads. Repeat with capacitor C2 (10 μF). This is polarized, put the negative lead into the hole with the square pads. Connect the LED, L2. The cathode (the shorter lead) goes into the hole with the square pads - note also that the LED has a flat on one side that should line up with the flat on the PCB. Color choice is not important. Solder and cut off the excess leads. Connect the 8 pin Integrated Circuit (IC) socket U1, and solder. Note polarity - there is a notch at the end with pin 1. Put a 555 integrated circuit in the socket, noting polarity. Put a battery in. LED L1 should turn on, LED L2 should flash. Adjusting R4 should change the frequency of the flashing. If this happens, move on - if not identify and fix the problem. Remove the battery.
Step 2 - low frequency oscillator: (blinky)
Step 3 - high frequency oscillator: Put resistor R7 (brown black orange - 10 KΩ) into the board and solder it. Cut off the excess leads. Repeat with resistors R6 (brown black red - 1 KΩ) and R9 (brown black brown - 100Ω). Put in potentiometer R8 (10 KΩ). Solder and cut off the excess leads. Place capacitor C3 (0.1 μF) into the board and solder it. Cut off the excess leads. Connect the 8 pin Integrated Circuit (IC) socket U2, and solder. Note polarity - there is a notch at the end with pin 1. Put a 555 integrated circuit in the socket, noting polarity. Connect the speaker at J1. Put a battery in. LED L1 should turn on, LED L2 should flash, and the speaker should sound. Adjusting R8 should change the tone. If this happens, move on - if not identify and fix the problem. Remove the battery. (Note: if you want to increase the volume, you can replace R9 with a smaller resistor (or put a second resistor in parallel with it). This increases the current through the speaker, making it louder.) Step 4 - connecting the two oscillators: Put resistor R10 (brown black orange - 10 KΩ) into the board and solder it. Cut off the excess leads. Put in potentiometer R11 (100 kΩ). Connect the switch (U3). Put a battery in. LED L1 should turn on, LED L2 should flash, and the speaker should sound. Try pushing the button, the tone should change. If this happens, you're done - if not identify and fix the problem. Remove the battery. Congratulations, you're done!
Step 3 - high frequency oscillator:
Step 4 - connecting the two oscillators:
Congratulations, you're done!
email me with any comments on how to improve the information on this page (either presentation or content), or to let me know if you had any particular difficulties with this lab.
Back