Sound control AC voltage regulator circuit

Published:2011/4/12 3:20:00 Author:Nicole | Keyword: sound control, AC voltage regulator

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Parallel regulated power supply composed of LM109

Published:2011/4/12 3:35:00 Author:Nicole | Keyword: regulated power supply

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Trimming bistable regulated power supply composed of LM109, LM120

Published:2011/4/12 3:41:00 Author:Nicole | Keyword: regulated power supply

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-10V, 1A regulated power supply composed of LM105 integrated regulator, LM195 power transistor

Published:2011/4/12 3:44:00 Author:Nicole | Keyword: regulated power supply, integrated regulator, power transistor

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110V regulated power supply

Published:2011/4/12 3:51:00 Author:Nicole | Keyword: regulated power supply

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Micro-power polarity reversal circuit diagram composed of MAX1721

Published:2011/4/2 4:34:00 Author:Nicole | Keyword: Micro-power polarity reversal

As shown, micro-power polarity reversal composed of miniature (SOT23 package) inverting charge pump IC MAX1721. This circuit just need take a 0.33μF little capacity, small size capacitor on the outside of MAX1721, then the polarity reversal can be completed, that is the output voltage Vo =- Vi.   (View)

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DC voltage bidirectional out-of-limit alarm circuit

Published:2011/4/6 4:10:00 Author:Nicole | Keyword: DC voltage, bidirectional out-of-limit

This alarm circuit will issue a directive when the power voltage is higher or lower a range, to remind us to adopt necessary measures. In this circuit, W2, W3 determines the starting value of upper and lower limit alarm. Circuit adjustment can be done by using a regulator.   (View)

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Multi-channel detector circuit

Published:2011/4/12 4:13:00 Author:Nicole | Keyword: detector

Using any fire, smoke, heat or other detectors and connecting to the primary relaxation oscillator, using GE-X5 thyristor to push 8Ω loudspeaker emits keke . Loudspeaker, 22.5V battery, 100kΩ and on/off switch are in series with the both ends of thyristor; connected a 1μF/25V capacitor to the both ends of thyristor-loudspeaker. Such as using cadmium sulfide photocell can detect the flashlight light beam of interloper.   (View)

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AC electric welding machine no-load energy-saving circuit

Published:2011/4/6 4:11:00 Author:Nicole | Keyword: electric welding machine, energy-saving

As shown in the figure, T1 is AC electric welding machine transformer. The power switch HK turns on, power transformer T2 obtains the electricity first, filter capacitor C1 obtains about 12V AC voltage. IC1, IC2 is two 555 time base IC. Because the voltage of initial state C2 is 0, the ②、⑥ pins of IC1 is low level, so ③ pin is high level, relay K is not pull-in, AC contactor KM is not work, electric welding machine is no energizing. At the same time, the multivibrator composed of IC2 starts working, the output frequency of ③ pin is about 10kHz pulse singal. After through R5, the later singal is added to one end of T1 secondary, the other end is connected to the grouding of control circuit, duing to T1 secondary winding has large inductance about 10kHz singal, so the current of this loop is lower, the voltage of transformer L is lower too. the other singal is coupled to C4, after VDR、VD9 rectifiers, C5 filter, the DC voltage turns VT1 on, VT2 off. So C2 is without charge current, IC1③ pin keeps high level. The circuit is in no-load energy-saving state.   (View)

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Laser transmitter linearity control circuit

Published:2011/4/6 4:11:00 Author:Nicole | Keyword: laser transmitter, linearity control

Used optical feedback technique can keep constant laser output in a wide temperature range. This circuit is a optical negative feedback circuit which is insensitive to temperature.   (View)

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Laser diode singal source circuit

Published:2011/4/6 4:11:00 Author:Nicole | Keyword: laser diode, singal source

This circuit uses laser diode as switch, can obtain 10ns pulse, the repetition rate is more than 100kHz. This circuit is used in optical fiber communication system, the fiber-optic bundle or single fiber can be coupled to laser.   (View)

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Resistance value choice circuit

Published:2011/4/11 4:15:00 Author:Nicole | Keyword: resistance value, choice

This circuit adopts LED indicates whether the measured resistance value is in the 5% range of reservation precision, removing the too large or too small resistance. If make a few changes to circuit parameter, thenit will change the precision precision range.   (View)

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Timing circuit

Published:2011/4/6 4:11:00 Author:Nicole | Keyword: timing

This timing circuit only use a 5GI555 IC and a TRIAC, with other components form non-contact timer. The timing time 1h is continuous regulation, and the loading power is 200W with low power consumption.   (View)

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Radiation thermometer circuit

Published:2011/4/8 2:46:00 Author:Nicole | Keyword: radiation thermometer

The detecting element is lead sulfide photosensitive resistance, it can measure the surface temperature more than 100℃. TR1~TR3 are 3 stage amplifiers, they are fixed on the detector, through bootstrap function of bias circuit, match input to 300kΩ resistance of radiation detecting element(6ISV). Adding bias voltage to all levels, to minimize the noise. When enviroment temperature rises, the thermistor with 2kΩ NTC adjusts gain, to make up for the reduction of radiation detecting element sensitivity. Final follower drives main amplifier and indication ammeter(no gave). Radiation detecting element outputs 0.3mV, can obtain 1mV through preamplifier, main amplifier outputs 20mV, it has 10% partial difference in the most sensitive range of 200μA ammeter. This circuit has 5 measuring ranges, the range of measuring temperature is 100~500℃.   (View)

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The charging system structure chart of distributed valve control seal lead acid storage battery

Published:2011/4/8 2:47:00 Author:Nicole | Keyword: valve control, plumbic acid battery, charging system

Adopting distributed system is a good way to solve the charging problem of large scale large capacity valve control seal plumbic acid battery, the host is used to monitor overall system, the slave computer is some high power chargers with same structure.   (View)

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High output voltage integrated regulated power supply circuit 1

Published:2011/4/8 2:48:00 Author:Nicole | Keyword: high output voltage, regulated power supply

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Tracing integrated regulated power supply with positive voltage tracking negative voltage

Published:2011/4/8 2:48:00 Author:Nicole | Keyword: regulated power supply, positive voltage, negative voltage

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Isolating circuit with gain compensation

Published:2011/4/8 2:49:00 Author:Nicole | Keyword: isolating, gain compensation

The total harmonics distortion of this circuit is lower than 1%, and it can automatic regulation the gain variations which is produced by temperature or other DC in photoelectric isolator. After sampling, the output singal is fed back to FET, to keep constant AC gain.   (View)

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The integrated chip LR745 application case circuit of switching regulated power supply start-up circuit

Published:2011/4/8 2:51:00 Author:Nicole | Keyword: switching power supply, integrated chip

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Switching regulated power supply overcurrent protection circuit

Published:2011/4/8 2:52:00 Author:Nicole | Keyword: switching regulated power supply, overcurrent protection

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