Electronic Circuit "Beans"

I will
some of the electronic
circuits which has the specific function.
I named these pages "Circuit beans", getting
the hint from "JAVA beans".
The circuits to be introducing on these pages are the circuits
which I thought that is "practicality" and/or "it is fun" with my sense.
By combining them, I think that you can make the wonderful one with your idea.
I am glad if they become the help of your idea.

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Differentiation circuit
Integration circuit
Simple amplifier
555 timer
555 oscillator
A-stable multivibrator (IC type)
A-stable multivibrator (TR type)
DC/AC inverter (1)
DC/AC inverter (2)
+12V/-12V Power supply unit
+/-12V -> +/-5V Power unit
+30V power supply with +5V
+30V DC-DC converter
Switching regulator (1)
Switching regulator (2)
Electric power controller
LCD thermometer
Square wave oscillator (1)
Square wave oscillator (2)
Triangular wave oscillator
Sawtooth wave oscillator
Sine wave oscillator
Sine/Cosine wave oscillator
LED counter
Frequency induction switch
Digital dial
PLL synthesizing oscillator (1)
PLL synthesizing oscillator (2)
PLL synthesizing oscillator (3)