See the explanation here.
High-End Audio Modular Preamplifier
This circuit isn't easy to built but you will get a great audio quality from this circuit. This circuit will give u a high quality preamplifier, capable to drive high quality power amplifiers with good sound.
See the explanation here.
See the explanation here.
Digital Clock
This is digital clock schematic diagram. This circuit is quite complex and quite difficult for a newbie because this circuit uses IC with some a complicated connections. The voltages that supplied to the circuit are divided in two lines.
Small Surround Sound Decoder
This is surround sound decoder. With this circuit, you can divide the 2 channel (R and L channel) stereo output become 4 channel output that are R channel, L channel, Center out and Rear out. This circuit will enrich your audio sound system.
For full explanation about this circuit, please visit this PAGE
3-3.5 Watt FM transmitter circuit
This is 3-3.5 Watt FM transmitter circuit. With this power, it should be able to reach 3-5 KM distance. The frequency range is about 90-110 MHz.
Component list
| Part | Total Qty. | Description | |
| R1,R4,R14,R15 | 4 | 10K 1/4W Resistor | |
| R2,R3 | 2 | 22K 1/4W Resistor | |
| R5,R13 | 2 | 3.9K 1/4W Resistor | |
| R6,R11 | 2 | 680 Ohm 1/4W Resistor | |
| R7 | 1 | 150 Ohm 1/4W Resistor | |
| R8,R12 | 2 | 100 Ohm 1/4W Resistor | |
| R9 | 1 | 68 Ohm 1/4W Resistor | |
| R10 | 1 | 6.8K 1/4W Resistor | |
| C1 | 1 | 4.7pF Ceramic Disc Capacitor | |
| C2,C3,C4,C5,C7,C11,C12 | 7 | 100nF Ceramic Disc Capacitor | |
| C6,C9,C10 | 3 | 10nF Ceramic Disc Capacitor | |
| C8,C14 | 2 | 60pF Trimmer Capacitor | |
| C13 | 1 | 82pF Ceramic Disc Capacitor | |
| C15 | 1 | 27pF Ceramic Disc Capacitor | |
| C16 | 1 | 22pF Ceramic Disc Capacitor | |
| C17 | 1 | 10uF 25V Electrolytic Capacitor | |
| C18 | 1 | 33pF Ceramic Disc Capacitor | |
| C19 | 1 | 18pF Ceramic Disc Capacitor | |
| C20 | 1 | 12pF Ceramic Disc Capacitor | |
| C21,C22,C23,C24 | 4 | 40pF Trimmer Capacitor | |
| C25 | 1 | 5pF Ceramic Disc Capacitor | |
| L1 | 1 | 5 WDG, Dia 6 mm, 1 mm CuAg, Space 1 mm | |
| L2,L3,L5,L7,L9 | 5 | 6-hole Ferroxcube Wide band HF Choke (5 WDG) | |
| L4,L6,L8 | 3 | 1.5 WDG, Dia 6 mm, 1 mm CuAg, Space 1 mm | |
| L10 | 1 | 8 WDG, Dia 5 mm, 1 mm CuAg, Space 1 mm | |
| D1 | 1 | BB405, BB102 or equal (most varicaps with C = 2-20 pF [approx.]) | |
| Q1 | 1 | 2N3866 | |
| Q2,Q4 | 2 | 2N2219A | |
| Q3 | 1 | BF115 | |
| Q5 | 1 | 2N3553 | |
| U1 | 1 | 7810 Regulator | |
| MIC | 1 | Electret Microphone | |
| MISC | 1 | PC Board, Wire For Antenna, Heatsinks |
Source: electronic-lab.com
Mini FM Transmitter
Here the schematic diagram of mini and simple fm transmitter.
Supply voltage : 1.1 - 3 Volts
Power consumption : 1.8 mA at 1.5 Volts
Range : 30 meters max. at 1.5 Volts
Here the PCB Layout:
Supply voltage : 1.1 - 3 Volts
Power consumption : 1.8 mA at 1.5 Volts
Range : 30 meters max. at 1.5 Volts
Here the PCB Layout:
3 Line Mixer
Actually, you can modify this circuit become more than 3 lines mixer. Just add and repeat the input parts (P=10K R=22K).
Schematic diagram:
Component placement:
PCB layout:
Schematic diagram:
Component placement:
PCB layout:
500 Watt Power Inverter
Here the 500 Watt power inverter schematic diagram.
Revised by: Ronnie B. Tabanao
Click the image to get bigger size of schematic diagram and then save the image... or download the circuit diagram from here