True or false:

1. Capacitors pass higher frequencies and block low ones
2. Coils pass low frequency and block high ones
3. Time Period (T) = 0.693 × (R1+2×R2) × C1 Seconds
4. Frequency (F) = 1.44 / (R1+2×R2) × C1 Hertz (Hz)
5. f = 1/T TRUE/FALSE
6. C1 is used as a Smoothing Capacitor? TRUE/FALSE

Questions

1. What will happen if two keys are pressed simultaneously?
2. In which particular operating mode the 555 IC is used in the harmonium:
   Astable (free-running) mode – The 555 can operate as an electronic oscillator. The 555 can operate as an electronic oscillator. Uses include LED and lamp flashers, pulse generation, logic clocks, tone generation, security alarms, pulse-position modulation.
   Monostable (one-shot) mode – In this mode, the 555 functions as a "one-shot" pulse generator. Applications include timers, missing pulse detection, bounce-free switches, touch switches, frequency dividers, capacitance measurement, pulse-width modulation (PWM), and so on.
   Bistable (flip-flop) mode – The 555 operates as an SR flip-flop. Uses include bounce-free latched switches.
   Schmitt trigger (inverter) mode – the 555 operates as a Schmitt trigger inverter gate which converts a noisy input into a clean digital output.
3. What is different in IC 556 (Five Five SIX) ?
4. What is different in IC 558 (Five Five EIGHT) ?
5. C1 (10 micro Farad) is used as a:
   Smoothing Capacitor
   Coupling Capacitor
   Bypass Capacitor
   Filter Capacitor
6. When the Note select probe is placed on the strip (key) connected to R16 (SA), a frequency of _ _ _ _ Hz is produced HINT
7. When the Note select probe is placed on the strip (key) connected to R15 (NI), a frequency of _ _ _ _ Hz is produced
8. When the Note select probe is placed on the strip (key) connected to R14 (PA), a frequency of _ _ _ _ Hz is produced
9. When the Note select probe is placed on the strip (key) connected to R9 (SA), a frequency of _ _ _ _ Hz is produced
10. When the Note select probe is placed on the strip (key) connected to R2 (SA), a frequency of _ _ _ _ Hz is produced

Homework

• Prepare a spread sheet with formulas to do the above Resistance to Frequency calculation
  
• Prepare a C-program with formulas to do the above Resistance to Frequency calculation
• Program your scientific calculator with formulas to do the above Resistance to Frequency calculation