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Procedure of assembly wiring
of a-stable multivibrator

It is necessary to do endurance to make a circuit. I describe an implemented procedure below. There are many paginations of the explanation, but it is not terrible work if the point can be understood.

The position of the hole is expressed in the figure and alphabet for convenience of explanation.
I decide the position of the part by the position of previous part. 2 holes up, 3 holes left from previous part like that. So, the mounting position of the first part is important. When you mistake first mounting position, it has mistaken all after that.

	The wiring under IC1
	Mount the IC socket
	Mount the diode D2
	Mount the resistor R2
	Mount the resistor R1
	Mount the diode D1
	Mount the capacitor C5
	Mount the capacitor C6
	Mount the resisitor R3
	Mount the resisitor R5
	Mount the transistor TR1
	Mount the resistor R4
	Mount the Light Emitting Diode D3(red)
	Mount the transistor TR2
	Mount the resistor R6
	Mount the Light Emitting Diode D4(green)
	Mount the capacitor C1
	Mount the capasitor C2
	Mount the three terminals voltage regulator IC2
	Mount the capasitor C3
	Mount the capacitor C4

Up to here,
all the parts could be fixed on the printed board.
Next is the wiring that used tin coated wire.

	The ground wiring of C1, C2, C3, C4 and IC2
	The ground wiring of IC1
	The ground wiring of TR1 and TR2
	The +5V wiring
	The +12V wiring of R4 and R6
	The +12V wiring of C1 and C2
	Soldering of the unuse lead of IC socket
	Attach the spacer to the printed board

Up to here
the assembly, wiring of the circuit finished.

Next, confirm the normal connection of the complete circuit. The assembled circuit has the possibility that there are mistakes like loose soldering. Loose soldering does not find just it looked. There is a mistake to find when working a circuit, too.
It is OK rather than the way of my mentioning. Confirm in the appropriate way which you think of.
In case of connection check, confirm between each component lead as much as possible. When confirming with soldering part of the wiring side, loose soldering sometimes can not be found.

	Check the ground wiring
	Check +12V wiring
	Check +5V wiring
	Check other wiring
	Check the shotage of the power line

The check of wiring finished.
Next is an operation confirmation test.

Yet, IC1 does not mount to the IC socket.

	Connection of the power supply
	Check the power supply voltage
	Mount the IC1
	Check the operation

Are red and green LED flickering alternately ?

With over the assembly, wiring work of the circuit are completion.