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A-stable multivibrator
(TR type)

I will introduce the a-stable multivibrator circuit which used two transistors.
The a-stable multivibrator is the circuit which repeats the high level (H) condition and the low level (L) condition alternately.
éhIn case of the transistor type, the voltage (Vcc) of the power supply can be comparatively freely set compared with the IC type. Also, it is possible to assemble compactly compared with the IC type when considering the power circuit and so on, too.
However, because VEB is a maximum of 5V in the case of a transistor called 2SC1815 used this time, as supply voltage, it's to 5V. For details, please look at circuit explanation.

Circuit and pattern drawings

Circuit explanation

Parts explanation

Calculation of the blink period