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U1
change my C3 and C4 to 15pF
iiakilii

iiakilii

@copilot change my C3 and C4 to 15pF
1y

copilot

To update the capacitors C3 and C4 to 15pF in your project, you should:
  1. Update their capacitance specification to 15pF.
  2. Make sure the part number and manufacturer details reflect this change if needed. Since you originally had a specific model (Murata Electronics' GCM1555C1H220JA16D), look up a similar component offering 15pF.
Would you like any recommendations for a specific 15pF capacitor, or do you already have a preferred model in mind?
1y
iiakilii

iiakilii

Can you help me with C1? Is it even logical to add it?
1y

copilot

The capacitor C1C1 specified in the project has a very large capacitance value of approximately 13,360µF, which is quite unusual for a heart rate monitoring device. Here are a few considerations:
  • Purpose: In electronics, large capacitors are often used for energy storage or filtering purposes, such as stabilizing power supply rails. For a heart rate monitor, though, this seems excessive unless it's part of a specific power supply or surge protection design.
  • Physical Size: Capacitors with capacities in the thousands of microfarads are generally physically large, making them impractical for portable or wearable devices like heart rate monitors.
  • Voltage Rating and ESR: If such a large capacitor is used, ensure that its voltage rating and equivalent series resistance (ESR) match the specifications needed for your application.
  • Space and Cost: Consider whether the PCB can accommodate such a large component and whether the additional cost is justified.
Before proceeding with C1C1, it's important to reassess its purpose and explore whether a smaller capacitance could fulfill the same role. Would you like to discuss possible alternatives or adjust its intended function?
1y
6
C1 (~13360uF)
Capacitance
Capacitance
RB0
VO (U2)
RC5
RB1
R4
Resistance
33kΩ
LED1
RC2
U2
LED2
R3
Resistance
150 Ω
RA0/AN0
C2
Not Recommended for New Designs
Capacitance
220uF
DB4 11
C4
Capacitance
0.015uF
DB6 13
RC4
Q1
RC6
BAT1
C3
Capacitance
0.015uF
R1
Resistance
4.7kΩ
E 6
DB5 12
X1
VCC (+5V)
R2
Resistance
1kΩ
R/W 5
DB7 14
K1
RS 4
U3

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AAI Rhythm Board

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Heart rate monitoring device design

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