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Monostable or “One-Shot" +5 V R 330Ω 2N7000 10 μF +5 V 330Ω Q1 2N3904 © Bob York R 33 kΩ C 100 μF 100 kΩ 330Ω Q2 2N3904 BiStable +5 V Vcc Rc1 Rc2 Rb2 Q1 Rb1 Q2 330Ω 10 kΩ 2N3904 330Ω 2N3904 Set © Bob York 10 kΩ Reset Astable +5 V 100 kΩ 330Ω 100 kΩ 10 μF 2N3904 © Bob York 330Ω 10 μF 2N3904 Simple Schmitt Trigger R2 Vin R1 Vout Vout + Vref Vref © Bob York Vin LM393 This output stage requires a pull-up resistor for most applications © Bob York Relaxation Oscillator Generic Dual-Supply Implementation R1 Single-Supply LM393 Implementation Pullup resistor (required for most LM393 comparator circuits) R2 V+ +Vs + -Vs C © Bob York V- R Voltage at this node sets triggering point. Additional 100k resistor to V+ is required because the low outptu state is 0V, not –Vs as in the dual supply implementation. Duty Cycle © Bob York Simple PWM Circuit Vs V1 12 V R3 R6 Vs 33kΩ 10kΩ 50% Key=A Vs R4 R5 100kΩ V+ 100kΩ Vs R1 4.7kΩ 8 3 1 R7 4.7kΩ 8 Vb 5 PWMout 7 2 4 U1A TLC393MJG 6 R2 22kΩ C1 100nF © Bob York 4 Va U1B TLC393MJG 555 © Bob York 555 Astable 12V Vs 4.7kΩ R1 22kΩ R2 8 VCC 4 RST 7 DIS 6 THR 2 TRI 5 CON OUT GND 1 100nF C © Bob York LM555CM Timer 100nF Cf 3 Output 555 PWM Speed Controller 12V Vs R3 1kΩ R5 33kΩ 8 LM555CM Timer VCC Q1 2N3906 4 RST 7 DIS 6 THR 2 TRI 5 CON R4 2.2kΩ OUT 3 GND 1 100nF C Ramp 100nF Cf 12V Vs R1 10kΩ 12V Vs R3 1kΩ R5 33kΩ 8 LM555CM Timer VCC Q1 2N3906 4 RST 7 DIS 6 THR 2 TRI 5 CON R4 2.2kΩ OUT R6 10kΩ 50% Key=A 3 12V Vs R2 10kΩ 5 1 100nF C 100nF Cf Ramp 7 6 C3 100nF © Bob York R7 1kΩ 8 GND 4 U1B TLC393MJG PWMout Fan Driver +12 V 2N7000 M 2N7000 Vin R8 1 kΩ © Bob York DC motor/fan 0.1 μF
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