Design an asynchronous pacemaker timing circuit using a 555-timer chip. Use the pulse generator circuit below. In particular specify values of the resistors and capacitor that would give a pulse frequency of 70 beats per minute, and pulse widths of 2ms.

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I 6 _+vcc 8 Reset Discharg Trigger Threshold 5 I'¹⁰ 4 -10n O/P 1 3 Capacitor Voltage 2/3 Vcc 1/3 Vec Output Voltage T₂ Vcc Charging through R1 and R₂ .Tc Discharging through R₂ tim -TON tt - TD TOFF T₁ 1 = I 2 = 0.7 (R+R₂) C 0.7 R, C ******** I 6 _+vcc 8 Reset Discharg Trigger Threshold 5 I'¹⁰ 4 -10n O/P 1 3 Capacitor Voltage 2/3 Vcc 1/3 Vec Output Voltage T₂ Vcc Charging through R1 and R₂ .Tc Discharging through R₂ tim -TON tt - TD TOFF T₁ 1 = I 2 = 0.7 (R+R₂) C 0.7 R, C ********