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OPA604 High Performance and Small Power Audio Amplifier Circuit

Published:2011/6/24 13:21:00 Author:Michel | Keyword: High Performance, Small Power, Audio, Amplifier Circuit

OPA604 High Performance and Small Power Audio Amplifier Circuit
The above picture is high performance and small power audio power amplifier circuit.This circuit's former level uses the mosfet hi-fi op-amp OPA604 and next level adopts high-speed buffer BUF634 and voltage series negative feedback is used between two levels amplifiers. This circuit voltage magnification depends on two resistances (5kΩ and 250Ω)of feedback branchs and its value is l+5kΩ／250Ω≈21 times.BUF634 is high-speed buffers and itsinternal structure simplified circuit is shown in figure (b). (View)

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TV remote control 01 circuit

Published:2011/7/2 4:35:00 Author:John | Keyword: TV remote control

TV remote control 01 circuit
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TV remote control 02 circuit

Published:2011/7/2 4:36:00 Author:John | Keyword: TV remote control

TV remote control 02 circuit
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electrical equipment overheating "brakes" voice alarming circuit

Published:2011/7/2 2:00:00 Author:John | Keyword: electrical equipment

electrical equipment overheating brakes voice alarming circuit
The figure shows the electrical equipment analog voice alarming circuit. It consists of overheating electronic switch, controlled multi-vibrator, analog voice circuits, audio amplifier circuit and AC buck rectifier circuit. The controlled multi-vibrator consists of 555, R2, R3 and Cl and so on. Its multivibrator frequency is that the icon parameter oscillation period To (= 1/fo) is equal to 10s. (View)

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Southeast Lioncel engine multi-point injection (MPI) Y with the computer system circuit

Published:2011/7/2 2:02:00 Author:John | Keyword: computer system, engine, multi-point injection

Southeast Lioncel engine multi-point injection (MPI) Y with the computer system circuit
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MAX1501 charger circuit

Published:2011/7/2 1:50:00 Author:John | Keyword: charger

MAX1501 is a new generation of rechargeable chip. MAX1501 is used to simplify the design of the charger. MAX1501 can be set as the single cell Li-Ion battery charging controller and can also be set as charging controller with three nickel cadmium batteries and Nickel metal hydride battery in series. MAX1501 charger circuit is as shown. (View)

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Electronic energy saving lamp (3)

Published:2011/6/30 2:08:00 Author:Ecco | Keyword: Electronic, energy saving, lamp

Electronic energy saving lamp (3)
In the circuit shown as the chart, T uses E5 ferrite core with Φ0.2mm high-intensity polyester wire, and L1, L2 have about 12 to 30 turns, and L3 has 200 turns; RT uses RTC thermistor, such as MZ11B, MZ64 types. (View)

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The DC/AC double purpose dark room safelight

Published:2011/7/2 2:25:00 Author:Borg | Keyword: double purpose, dark room safelight

The DC/AC double purpose dark room safelight

This DC/AC double purpose dark room safelight has the function of pointless auto converting switch. It is adopted with orange LED. When the power is normally supplied, the AC 220V is rectified by the transformer, filtered by the capacitor, and then is turned into a 4V or so DC (it's 5V when it is in empty load). As the voltage of the battery in the machine is 3V, the diode D is conducting and powered by the rectifier power supply. As the BG emitter LEV is lower than the basic LEV, therefore, BG is blocked, the battery E is cut off automatically and there is no current out.When the power is off, the LEV of BG emitting pole is higher than the basic pole LEV. (View)

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The simple touching switch

Published:2011/7/2 3:27:00 Author:Borg | Keyword: simple touching switch

The simple touching switch
In experiments, the writer found that the single-way SCR (MCR100-8) control pole can be conducted by hand touch without any forward voltage. Therefore, the writer designed a simple touching switch, whose circuit is shown in the figure. Just by touching the metal chip, SCR1 is conducting, so the load is getting power and working; by touching the metal chip, the switch is off and SCR2 is conducting, the relay 1 is getting power and working, K is cut off, the load loses power, after SCR2 is broken down, the capacitor is discharging power to relay J, which keeps the relay close about 4s. (View)

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The simple power-off self-lock circuit

Published:2011/7/2 3:14:00 Author:Borg | Keyword: power-off, self-lock

The simple power-off self-lock circuit
When the grid is supplying power normally, it is like an ordinary switch. By pressing K1, the 220V AC is distributed to the dual-way SCR as the trigger voltage, which makes the SCR conducting. When the SCR is conducting, during the positive half-cycle period of the power supply, a little current is charging C through R4 and D, at the same time, after being distributed by R3 and R2, it charges the SCR; in the passive half-cycle, C discharges R3 and R2 and then triggers the SCR, so that the SCR keeps conducting, which makes sure the load work normally. Once the grid was power-off suddenly, C would be discharging through R3 and R2. (View)

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The simple electric water tag circuit

Published:2011/7/2 3:01:00 Author:Borg | Keyword: electric water tag

The simple electric water tag circuit
1.working principle The circuit is shown in the figure. PC is a photoelectric coupler, whose feature is that the input and output is fully separated, so it is safe. S is the key switch of step type. The 220V mains is half-wave rectified by the diode D, filtered by capacitor C, and then distributed by R4 and R5, finally, it becomes an output DC voltage of about 10V which is added on the C pole of the triode in the PC. Usually, S is opened, the LED in the PC has no current and is not glowing, the light dependent triode is blocked, the transistor V is blocked. (View)

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The simple and useful 3-key interlock electric switch circuit

Published:2011/7/2 4:16:00 Author:Borg | Keyword: 3-key interlock, electric switch

The simple and useful 3-key interlock electric switch circuit
The structure of the circuit is simple, a channel is opened by pressing a corresponding key, meanwhile the other 2 channels are closed. The contactor shake does not affect the working of the circuit, so the anti-disturbance ability is good. If the drive triode in the back was removed, the static power consumption of the circuit would almost 0. If the key was removed, the circuit would be the pulse control. (View)

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The simple self-lock switch circuit

Published:2011/7/2 2:38:00 Author:Borg | Keyword: self-lock switch

The simple self-lock switch circuit
See as the figure, before AN is pressed, SCR1 is blocked, the relay or contactor is still, which is equal to OFF state. When AN is pressed, with the help of R1,AN and VD1,the 12V voltage provide for SCR1 with trigger current which makes it conducting, so K gets power and the contactor is connected with the load and gets into work. As the voltage on the two terminals of the capacitor can't mutate, so SCR2 is not conducting when AN is pressed, the current is charged to C by R3 and VD2. If AN is pressed again, the voltage on C is becoming the trigger voltage of SCR2, which makes SCR2 conducting when AN is blocked. (View)

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An object approaching switch circuit

Published:2011/7/2 2:28:00 Author:Borg | Keyword: switch circuit

An object approaching switch circuit
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The simple 2-terminal source free electric energy saving switch circuit

Published:2011/7/2 3:40:00 Author:Borg | Keyword: 2-terminal, source free, energy saving switch

The simple 2-terminal source free electric energy saving switch circuit
By pressing S, the 220V AC current is charging C through V5 after it is rectified, when the voltage on the capacitor is higher than the trigger voltage of the single way SCR control pole, the SCR is triggered and conducting, and the bulb is lighting. After S is released, the electricity of the capacitor is discharging through resistor R, which keeps the single-way SCR conducting, when the time reaches the set time (the lighting time of this circuit parameter is from 1 to 2min), the single-way SCR is cut off when the current is lower than the maintaining current, the bulb is cut off. (View)

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The 3 additional circuits of relays

Published:2011/7/2 4:05:00 Author:Borg | Keyword: additional circuits, relays

The 3 additional circuits of relays
The relay is a common element in electronic circuit, which often consists of the electric switch drive circuit formed by the transistor, relay and others, and other circuits that can change the working features of the relay or fulfill protection function. The additional circuits of the relay has 3 pattens: 1. The relay parallel RC circuit: the circuit type is shown in figure 1, and it is often used in the circuits that the regulated working voltage is lower than the power supply voltage. When the circuit is closed, the current in the relay coil is increaseing. (View)