This blog will keep to a simple theme of my tinkering with electronic and computer related toys, gadgets, projects and the like. I do hope from time to time there is something for someone to find when they are exploring these things for themselves. From an early age, I was always attracted to electronic gadgets an I continue to enjoy myself with my hobby. Unfortunately with a busy life, time becomes short an I can not indulge myself like in the past.
Same oscillator circuit and principle's as Experiments #36 and #37. But, with a different shape that is connecting various circles that produce different pitches in sound, like notes. I try each circle (key) twice than I try and play "Mary Had a Little Lamb".
This experiment is the same oscillator circuit and principle's of resistance in Experiment #36. But, using a pencil to create a different shape, hence a little different frequency of sound.
Here in this experiment, I am using the same basic oscillator circuit; in addition, pencil carbon to create different types of drawn resistors -- to change the frequency rate to make different sounds. By making the drawn resistors longer should increase the resistance (resistors in series); more over, making the drawn resistors wider should reduce the resistance (resistors in parallel).
This experiment uses a variable resistor to change the frequency of the sounds; in addition, when the switch is turned on, the capacitance of the oscillator is increased because the capacitors (.005 and .047 microfarad) are in parallel, and this lowers the oscillator frequency.
This experiment is basically the same as experiment #33, except for the placement of the 10 microfarad capacitor and a disc capacitor. The variable resistor is used as before to change the sound of the gun.
In this experiment, a variable resistor (0 to 50000 ohms) is used to control the oscillator's frequency rate. This give the effect of electronic rain (not real world rain) pouring down at very low resistance and drizzling at very high resistance.
This experiment is using the same basic oscillator circuit introduced in experiment #28. But, the oscillator's resistance is electronically varying. The 1,000,000 ohm resistor and 10 microfarad capacitor slowly increase the base voltage (base current) on the transistor (NPN-Left). As the base current slowly increases the collector current (NPN-left) also increases slowly. The transistor (NPN-left) is now limiting the current just as a resistor does. When the switch is turned off, a similar effect occurs as the 10 microfarad capacitor slowly discharges. Note: I short the capacitor at the end to silents the siren.
