❤️ Heart LED Soldering Kit ❤️ – Iffy Books

Animated GIF of a heart-shaped printed circuit board with red LEDs around the edge, slowly turning on and off

5mm LEDs x22
heart-shaped circuit board
LM358 op amp
S8050 transistor
22Ω resistor
10KΩ resistor
47KΩ resistors x3
100KΩ resistor
47uF electrolytic capacitor
50KΩ potentiometer
power switch
microUSB port for power
red & black wires

Separate the ends of your red & black wires and strip 1/4″ insulation from each wire end.

We recommend using lead-free solder, with your soldering iron set to 280°C–285°C. Higher temps may damage the components.

On one end, solder the red wire to VCC on the microUSB port and solder black to GND.

On the other end, solder the red wire to the positive (+) terminal next to “DC4–6V” on your circuit board and solder the black wire to the negative (-) terminal.

In contrast to the instructions below, we’ve been soldering on the LM358 integrated circuit last to avoid damaging it.

Photo of a red LED light with an arrow pointing to one lead with the text "longer lead." Below there's an LED circuit diagram symbol with + and - symbols on either side

Instructions for assembling a heart-shaped soldering kit with 22 LEDs around the edge, with 6 photos and the following text:
Installation Steps & Illustration
Step 1
Install Resistor: R3 = 100K; R5 = 22ohm; Step 2 Install 3 pcs 47K resistor on R1, R2, R4
R6 = 10K
Step 3 Install LM358. Note direction!
Step 4 Install 22pcs LED. Note direction!
Step 5 Install S8050 and Potentiometer.
Step 6 Install power switch. Note direction!

You can turn the potentiometer (blue and white component) with a small screwdriver to adjust the oscillation rate.