MINI ADAPTOR 12 VOLT

Part..:

U1	LM7812 +12 VDC Voltage Regulator
BR1	4 amp bridge rectifier
T1	18 volt, 2 amp ac transformer
F1	2 amp slow-blow fuse
S1	SPST toggle switch
R1	330 ohm resistor
C1	3,000 uF electrolytic capacitor, 35 volt min.
C2	100 uF electrolytic capacitor, 35 volt min.
LED1	Light Emitting Diode
MISC.	fuse holder, heat sink for U1, binding posts, ac cord with plug, chassis

all resistors are 5 or 10 percent tolerance, 1/4-watt
all capacitors are 10 percent tolerance , subtitusi LM 7812 = KIA 7812

Please operate caution when building this power supply. It is run on standard 22o ac . Use a plastic enclosure if possible to decrease chances of short-circuiting. Don't use the power supply if it's wet, and never run it without the specified fuse.

Power Amplifier Mini 2W+2W by TBA820M

This circuit TDA820M Mini Amplifier 2W+2W.
Supply Volt 12V, Easy to build and Low cost.
If you want mini amplifier circuit , as a result do not be defeated certainly. The sound will a little 2W+2W just but enough with 6 sizes are inch 8ohm loudspeakers. as a result still have a voice good loud the moderately. Request friends have fun the circuit amplifies this miniature please yes.

FM Transmitter

Free Kit Plan - FM Transmitter

Learn to build your own mini FM transmitter compliments of Cleveland Institute of Electronics.

This fun project will show you how to build a mini broadcasting device that can transmit an audio signal up to a quarter mile to any FM receiver. It's easy to build and a good learning experience and best of all - it's free!

This project was written by one of CIE's instructors. It serves as a hands-on learning tool for our students or anybody interested in electronics troubleshooting.

Having a range of up to a quarter mile, it's great for a house security system, baby monitoring device or simply a listening gadget that you can place anywhere!

C4 is a small, screw-adjustable, trimmer capacitor. Set your FM receiver for a clear, blank space. Then, with a non-conductive tool, adjust this capacitor for the clearest reception. Although this transmitter is designed for the FM broadcast band, it can be tuned to 2 meters, and other VHF bands by changing values of C4 and L1.

Close up

L1 is 9 turns of #22 gauge solid wire (air-wound) 1/4 inch diameter coil. Use a 1/4 inch diameter bolt and wrap the wire in the threads. After mounting the coil, back out the bolt.

C1, C2, C3, and C5 are ceramic type capacitors, preferably npo (low noise) or equivalent. However, you can use any type you have around, but do not use electrolytic or tantalum capacitors.

A 2N3904 transistor was used for Q1 and Q2. The 2N3904 is a general purpose silicon NPN bipolar transistor used for switching and amplifier applications. However, you may substitute the 2N3904 with a 2N2222 or a 2N3906, these are also general purpose transistors.

Back

The antenna is 8” to 18” of any type wire.

Try to keep all leads as short as possible to prevent stray capacitance.

Transmitter Parts:

R1, R4, R6 10K resistor
R2 1Meg resistor
R3 100K resistor
R5 100 ohm resistor
R7 1K resistor
C1, C2 0.1uf capacitor
C3 0.01uf capacitor
C4 5 - 30pf variable capacitor
C5 4.7pf capacitor
Q1, Q2 2N3904 transistor
L1 9 turns of #22 gauge
Microphone Electret Mic
Circuit Board
Battery Clip