Schematic & Wiring Diagram

Here the schematic diagram of mic preamplifier which build based on operational amplifier TC251. The TLC251 is operating in low bias. The circuit works with only 1.5 V supply draws electric current of only 10 mA, so the battery operation will be prefered. Circuit frequency response is 3dB, 27 Hz to 4.8 kHz.



Frequency Response:


The TLC251 are low-cost, low-power programmable operational amplifiers designed to operate with single or dual power supplies. Because the input common-mode range extends to the negative rail and the power consumption is very low, this chip is ideally suited for battery-powered or energy-conserving applications. A bias-select pin can be used to program one of three ac performance and power-dissipation levels to suit the application. The series features operation down to a 1.4V supply and is stable at unity gain.

Download the TLC251 datasheet document from the following link:
» Download link

This is the circuit diagram of stereo tube power amplifier. It applies 3 types of tube that are 2 6SF5 GT high-mu triodes, 1 5Y3 GT vacuum rectifier, and 2 6K6 power beam amplifiers. The Audio input can be from any two-channel line level device such as a television, CD player, or VCR. It is of the tube type, using only 5 tubes total with no more than about 45 Watts power consumption from the outlet.


Components List:
R1,R10,R13 = 2.2M Ohm Potensiometer
R2 = 470K Ohm
R3 = 1M Ohm
R4 = 220K Ohm
R5 = 330 Ohm 2W Resistor
R6 = 220K Ohm
R7 = 2.2M Ohm
R8 = 1M Ohm
R9 = 720 Ohm 20W Resistor
R11 = 33K Ohm
R12 = 22K Ohm
C1,C9 = 4nF 400V Capacitor
C2 = 50nF 600V Capacitor
C3 = 20uF/25V
C4 = 10nF 400V Capacitor
C5 = 200pF 400V Ceramic Disc Capacitor
C6,C7 = 15uF 450V Capacitor
C8 = 15uF 400V Capacitor
T1 = 117V Primary, 350VCT Secondary, 6.3V Secondary, 6.3V Secondary
T2 = 7600 Ohm Primary, 4 or 8 Ohm Secondary
SW1 = SPST Switch
SP1,SP2 = 12" or smaller, 4 or 8 ohm speakers
MISC = 5 tube sockets, 2 RCA jacks, PC board or chassis, wire, knobs, etc.

Stereo Tube Power Amplifier Circuit Notes:

1. C8 is for radio interference suppression and may be omitted.
2. The 6V6 GT tube may be substituted for the 6K6 to lower power requirements.
3. The 5Y3 GT tube should be mounted in a vertical position and be well ventilated. The 6K6 and 6SF5 tubes can be mounted in any position.
4. The power supply portion of this unit may be used for anything requiring 290-320v DC up to about 3 amperes.
5. Controls should have an audio taper.

Circuit Source: http://english.cxem.net/amplifier/amplifier13.php

Here the 12 LED VU meter circuit. This is a simple visual indication of the audio level signals, adaptive to various user needs. Can be adapted to different input levels, adjustable by trimmer TR1 (state) - TR2 (Gain), then rectified by diodes D1-D2 (standard negative mark-recovery periods) and driven in the main circuit indication, consisting of the diodes D3 up to D13, transistors Q2-Q13 and materials that exist around them.

The visual indicator is taken from the series of diodes LED LD1-13. Each Led illuminates when the level changed during about 0,65 V. The power requirements are 100 ma full term. We can add as many steps we want LED, always assuming the power where you need the new LED.

Components List

R1 = 47Kohm R2,3 = 1Mohm R4,R7 = 1Kohm R5 = 100ohm R6 = 18Kohm R9,11,13,15,17 = 560ohm R19,21,23,25,27 = 560ohm R29,31 = 560ohm R8,10,12,14 = 4.7Kohm R16,18,20,22 = 4.7Kohm R24,26,28,30 = 4.7Kohm C1 = 10uF/25V C2 = 100nF/100V MKT C3 = 4.7uF/25V

C4 = 4.7uF/25V C5 = 10uF/25V C6 = 47uF/25V C7-8 = 100nF/100V TR1 = 100Kohm Trimmer TR2 = 4.7Kohm Trimmer LD1 until LD7 = LED Green LD8,LD9,LD10 = LED Yellow LD11,LD12,LD13 = LED Red D1 until D13 = 1N4148 Q1 until Q13 = BC550C - BC549B IC1 = TL071 IC2 = 7812 [With Heatsink] All Resistors is 1/4W 1 -5%

12 LED VU Meter Circuit source page: users.otenet.gr

This is the schematic diagram of 2-way active crossover circuit. The "active" word means that the circuit use active component and need power supply to work. Take a note that the input of this circuit is not connected to the output of power amplifier. This crossover circuit module must be placed before the amplifier circuit. The "Low Out" output connected to a power amplifier and the low speaker [Woofer], while the "High Out" output is drive the power amplifier of high speaker [Tweeter].

Parts List

R1 = 100Kohms
R2,3,4,5,6 = 37.5ohms [33K+4.7K]
R7 = 75Kohms[150K//150K
R8 = N.C
R9,10,11,12,13,14,15,16 = 10Kohms
R17,18 = 47Kohms
R19,20 = 47ohms
C1 = 4.7uF/100V MKT
C2,3,4,5,6,7,12,13 = 1nF 100V MKT
C8,9,10,11,14,15 = 100nF 100V MKT
C16 = 2.2uF/100V MKT
C17 = 470nF 100V MKT
C18,19 = 47uF/25V
J1,2,3 = 2pin conn. 2.54mm pin step
J4 = 3pin conn. 2.54mm pin step
IC1,2,3 = NE5532 , TL072
TR1 = 100Kohms trim. or pot.
TR2,3 = 47Kohms trim. or pot.
All the Resistors is 1,2% 1/4W metal film

Circuit Source: 2-Way Active Crossover Circuit with Linear Phase Response

Notes:

• All pulses to be counted are to be TTL compatible. They should not exeed 5V and not fall below ground.
• You can add more digits by building a second (or third, or fourth, etc...) circuit and connecting the pin 11-6 junction of the 74LS90 and 74LS47 to pin 14 of the 74LS90 in the other circuit. You can keep expanding this way to as many digits as you want.
  

Here the schematic diagram of home telephone FM transmitter. This circuit connects in series with your home phone line and delivers the phone conversation through the FM band any time you pick up the telephone handset. Transmitted signal could be tuned by any FM receiver. The circuit features an "On Air" LED indicator and also gives you a switch that can be utilized to turn off the transmitter. A special characteristic of the circuit is the fact that no battery is required to operate the circuit because electrical power is taken from your phone line.



The transmitter circuit works by using only a short piece of wire aerial about 4" / 10 cm long to transmit the signal and a portion of the RF signal can also be radiated via the phone line itself. The circuit may possibly be implemented to share or record conversations, but will not be meant for illegal use.

Source: Home Telephone FM Transmitter Circuit

80W power amplifier circuit diagram based MJL4281A / MJL4302A and MJE15034 / MJE15035 power transistor. Actually the output power range is about 60W to 80W. This is an incredibly excellent amplifier. It's easy to construct, applies generally offered parts and is stable and well-performing. The diagram featured is really a full update on the original project, and even though it has a lot of similarities, is definitely a different design.



This amplifier circuit, even though extremely simple, is capable of great performance. This is not an amp to be under estimated, as the sonics are pretty good indeed, and this really is due (in part, at least) to the inherent simplicity of the diagram design. The amplifier is exceptionally quiet, and is reasonably tolerant of hard loads. It's an perfect amplifier for biamped systems, and may possibly be operated in bridge mode (BTL) in case you apply the suggested output transistors (which have the required power ratings).

Go to this 60-80W power amplifier page to get the detailed information about the circuit.

The following diagram is the circuit of CMoy headphone amplifier. Chu Moy designed a very popular headphone amplifier that’s easy to build, and it can be built small enough to fit in a pocket, power supply and all. It’s powerful enough to drive very inefficient headphones to thunderous volumes from even weak sources

CMoy headphone amplifier circuit diagram:


The op-amp used for this circuit is OPA2132PA, you may use OPA2132P or OPA2134PA as the alternative op-amp chip.



Power supply circuit for CMoy headphone amplifier:


Go to this page for the complete tutorial of CMoy headphone amplifier circuit.

Have you ever wondered how many various colours can illuminate a LED? One, two or possibly three? Making this simple circuit, you will discover it a lot more. The important component in this design is a dual LED. One such accessory includes two inside the 'slices' of different diode LED, that each and every of them produces a different color (commonly green and red). For the drive needs three pins, a common cathode and two separate roots. In this way every single of the two integrated diodes can light up as independent of one another. You'll find only two colors that may create this dual LED.



Setting appropriate percentage of the currents flowing via two separate channels of the POY is, we have other from pure green and red, orange (IR = 21G) and yellow (IG = 2IR). In this circuit, the anodes of the double LED driven by the outputs a six-point buffer tri-state technology CMOS. As opposed to most integrated family of CMOS 4000, the 4503 applied here, can supply many different loads on high currents of the order of 10 mA. The stream that goes towards the two diodes is limited by the resistors R1 to R6 whose specific values are those that attain the distinct colors and changing brightness them. The circuit was originally created to display three various situations, each expressed their the presence of logical '1 'in one of the inputs a, b, c. The entries are able to activate only one of every single time, and if none of them had been excited, a NAND gate (IC1c) ensured that the LED 'to create fourth color. In the improved version we present these days, the circuit has added another level oscillator (IC 1 a and IC1b), which produces about two pulses per second. The pulses are introduced in the entrance activation OA (pin 1) of 4503, resulting in colorful flashes. The oscillator is controlled by the of logical statements applied to the inputs 'd' and 'e'. If both are simultaneously logical '1 ', then each the oscillator and also the buffers of 4503 stay inoperative. If e = 1 and d = 1, then all buffers are driven in a state of high resistance plus the circuit absorbs the least feasible electric current (standby). The power supply circuit was initially set at 12 Volt, but all of the components that are able to work equally properly with any voltage in between 5 Volt and 16 Volt.

Notes.

• The circuit can be wired on a general purpose PCB or common board.
• The circuit can be powered from a 9V PP3 battery.
• The POT R1 can be used to adjust the rhythm of the sound.
• The POT R2 can be used as volume control.
• The speaker k1 can be a n 8 Ohm tweeter.

This is the diagram of 6V Gel Cell charger. The circuit is using NE555 timer as oscillator and TPI31T switching transistor. The schematic diagram designed by Tony Van Roon.



Parts List:

R1 = 22 ohm, 1W R2 = 270 ohm R3 = 220 ohm *R4 = 715 ohm, 1% *R5 = 3.57K, 1% *R6 = 1.40K, 1% *R7 = 1.47K, 1%

C1 = 100nF C2 = 100nF D1 = 1N4001 T1 = TIP31A, B, C (or equivalent) U1 = Timer IC NE555V (or equivalent) S1 = Toggle switch, ON-OFF

* Resistors type are carbon, 1/4 watt, 5% tolerance, unless otherwise indicated.



6V Gel Cell Charger circuit source page

This is the schematic diagram of variable power supply. The output voltage of this power supply circuit can be adjust from 0V to 28V DC, while the current output is static the rang is about 6A up to 8A.



Parts List:

R1 = 2K2 Ohm 2,5 Watt R2 = 240 Ohm R3,R4 = 0.1 Ohm 10 Watt R7 = 6K8 Ohm R8 = 10K Ohm R9 = 47 Ohm 0.5 Watt R10 = 8K2 Ohm C1, C7, C9 = 47nF C2 = 4700uF/50v – 6800uF/50v C3, C5 = 10uF/50v C4, C6 = 100nF C8 = 330uF/50v C10 = 1uF/16v C11 = 22nF

D1…D4 = four MR750 diodes (MR750 = 6 Ampere diode) or 2 x 4 1N5401 diodes. D5 = 1N4148, 1N4448, 1N4151 D6 = 1N4001 D10 = 1N5401 D11 = LED D7, D8, D9 = 1N4001 TR = 2 x 15 volt (30volt total) 6+- Ampere IC1 = LM317 T1, T2 = 2N3055 P1 = 5k P2 = 47 Ohm or 220 Ohm 1 Watt P3 = 10k trimmer pot F1 = 1 Amp F2 = 10 amp

Source: schematicdiagram.s4s.in

Notes.

• The circuit has to assembled on a good quality PCB or common board.
• The IC1 & IC2 has to be mounted on IC holders.
• Power the circuit from a 9V battery or 9V DC power supply.
• Switch S1 is push button switch.