Regulatory incandescent

When we sleep often feels bright lights in the room once, if we turn off our course will be darkness. It felt completely wrong. Now I'll show you a simple circuit that can help your problems in the bedroom.
Lihar picture series below:
















Katerangan image:
Light least incandescent lamps in the circuit can be arranged through VR.
Good luck.

Bird sound

In this series, a special hobby for people who listen to the sound of birds. In today's hobby listening to the sound of birds does not mean we must have a bird, with this simple circuit we can easily hear the sound of birds without the birds were exhausted and without feeding. Anytime, anywhere it's up to how long live push.
Consider the following series.














How it works:
Give the power supply on the set of sounds of birds will sing.
Good luck.

Circuit tester crystal

For us to know the condition of our crystal is in good condition or not, we need an electronic circuit that can provide the correct explanation. In order to create a circuit that can work well. Let us consider the circuit below.










How it works series:
X is the crystal which in tests, L1 is the indicator light. When the light is on means the crystal is broken.

Transistor Tester

Images and circuit scheme







Component List:
R1, 2.3 ... ... ... ... ... ... .. 6K8 C1 ... ... ... ... ... ... ... ... ... ... 100n D1 ... ... ... ... ... ... ... .. LED
R4 ... ... ... ... ... ... ... .... 22K ICI 1,2,3 ... ... ... ... ... ... .... 741 D2, 7.8 ... ... ... ... ... ... LED
R5, 7 ... ... ... ... ... ... ... .. TS = 100K transistors tested D3, 4,5,6 ... ... ... ... .... IN4148
R6 ... ... ... ... ... ... ... ... .. 10K

Description:
With this tool we can find out with a direct type with the material.
If Led D1 lit = PNP
Led lit when D2 = NPN
If Led D7 lit = Silicon
If Led D8 lit = Germanium
LED lamps can be used in a variety of colors.

Simak

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