Converter Circuit

Musical chime generator with ua741 oscillator

This is a musical generator that uses bandpass filter circuit with ua741 op-amp as act converts a sound signal in multiple feedback patterns. When connected the voltage input from a rhythm generator with a short pulse , makes it ring in natural resonance frequency. As the output oscillations vanish suddenly and resemble percussion or strum sounds naturally.
The higher the Q the longer the decay time constant. The VR1 is used to adjusts a Q value. The fo is 1/(185 x 1000 x C). The high frequency resonances resemble chimes, lower frequencies sound like calves or bongos. Several circuits, all with different tuning, driven by pluses from a rhythm generator can produce an interesting pattern of sounds.

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Single transistor phase shifter

This is a basic NPN transistor circuit which it provides a simple mean of obtaining phase shifts between zero and 170 degree.
The BC108 transistor works as a phase splitter, the output at point A being 180 degree without phase from the input.
Then Point B is in phase with the input phase.
Adjusting R1 gives the sum of different proportions of these and from now a successively variable phase shift.
The circuit operates perfect in the 600Hz to 4kHz range.

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simple nonlinear low pass filter

This simple circuit is nonlinear passive on low pass frequency filter. It ‘s small size and easy to made for do not used the external power supply, but refuse a lot of noise ripples and need to a input voltage is stable.
The circuit works best, when the signal level is importantly higher than the constant ripple level.
The circuit has specifically related to two peak-detecting sample-and-hold circuits in tandem with a voltage average.
There are parts in figure a few : D1-D4=1N4148, C1=100uF electrolytic ,C2 – 2.2uF ceramic, R1 -100K
I hope this circuit are a little ideas your, to a big project next time.

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