555 Timer Frequency Setup
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Below is a summary of the necessary connections for the main IC, the NE555S-13, showing each pin and its typical connection in a timer circuit:
Table
| Pin | Pin Name | Required Connection |
|---|---|---|
| 1 | GND | Connect to the system Ground (GND) |
| 2 | TRIG | Connect to the trigger network (typically through a resistor/RC network to sense the required threshold) |
| 3 | OUT | Connect to the load or subsequent circuit stage (e.g., a driver stage or indicator such as an LED) |
| 4 | RESET | Tie to VCC if not externally controlled to ensure normal operation |
| 5 | CONT | Connect a decoupling capacitor (commonly ~0.01 µF) from this pin to ground to filter noise |
| 6 | THRES | Connect as part of the timing network; in many configurations, it is tied with TRIG (via a resistor/capacitor network) |
| 7 | DISCH | Connect to the resistor network that controls the charging/discharging of the timing capacitor |
| 8 | VCC | Connect to the supply voltage (according to your design, e.g., 5V) |
These connections should serve as a guide depending on whether you choose an astable or monostable configuration for the NE555. You can now proceed to make the net connections on your schematic to reflect these relationships.
Connect NE555 pins
Add decoupling capacitors
Verify resistor-capacitor values
319 days
Ready.
U1 CONT - C2 P1
U1 TRIG - U1 THRES
U1 OUT - R3 P1
C1
Capacitance
100nF
C2
Capacitance
0.1uF
R2
Resistance
100 Ω
U1 TRIG - U1 THRES
U1 OUT - R3 P1
U1 DISCH - R2 P1
LED1
R1
Resistance
10k Ω
U1 TRIG - U1 THRES
U1
U1 VCC - U1 RESET
U1 DISCH - R2 P1
U1 TRIG - U1 THRES
D1
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|---|---|---|
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