Circuit Diagram

The battery voltage regulation charger circuit

Published:2011/7/18 1:56:00 Author:TaoXi | Keyword: battery, voltage, regulation, charger

As the figure 3-9 shows, the circuit uses the 555 as the comparator to control the charging current of the nickel cadmium battery. The input of pin-5 is stabilized at 5.1V by the zener diode VD2 that can be used as the reference voltage. If the voltage of rechargeable battery is lower than 2.55V, the 555 will be triggered, the output of pin-3 will be the high level, and it charges the battery through the 100Ω resistance and the diode VD1. At this time the pin-7 will cut off, the LED turns on to indicate the charging state. When the voltage of rechargeable battery is higher than the threshold voltage of pin-5, the timer will reset to stop the charging, pin-7 will conduct and the LED will turn off. The threshold voltage can be set by the fine-tuning resistance RP2.   (View)

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Long interval timer circuit

Published:2011/7/17 1:55:00 Author:Fiona | Keyword: Long interval, timer

Long interval timer circuit is shown as above:   (View)

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The charger with the simple circuit

Published:2011/7/18 0:57:00 Author:TaoXi | Keyword: charger, simple circuit

The charging principle diagram of this charger is as shown in figure 2-3. This charger can charge the no.5 or no.7 single or four nickel cadmium batteries synchronously. The features of this circuit: the subprime stage of the transformer uses the bifilar winding, when the coil A is in the positive half cycle, it charges the GB1, when the coil A is in the negative half cycle, it charges GB3. The charging current has three stages, when the switch is in the 1 stage, it can charge the 1.5V alkaline battery. The VD1-VD4 are the rectifier diode, the model is 1N4001, the VD5-VD8 is the LED charging indicator. The capacity of the transformer T >/=1W, the transformer secondary stage is the bifilar winding, the AC voltage is 4.5V-5V.   (View)

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Rapid zeropassage detector circuit

Published:2011/7/17 1:53:00 Author:Fiona | Keyword: zeropassage, detector

Rapid zeropassage detector circuit is shown as above:   (View)

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Voltage regulation, charging, inverter three-function instrument circuit

Published:2011/7/17 22:29:00 Author:TaoXi | Keyword: Voltage regulation, charging, inverter, three-function, instrument

The voltage regulation, charging, inverter three-function instrument can charge the battery when there is the city electricity, When the power is outage, the battery inverts the 220V AC for the household appliances, when the grid voltage is too high or too low, you can adjust the output voltage to 220V manually to ensure the safety of the electric equipments. The circuit of the three-function instrument is as shown in figure 3-6. In this figure, when the switches S1 and S2 are in the A position, the circuit is in the inverter status. The left part of the circuit forms the self-excited oscillator to produce the 50Hz square wave, and this wave is boosted by the transformer and adjusted by S3 to be the 220V output. When the S1 and S2 are in the B position, the circuit is in the charging state.   (View)

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Simple type nickel cadmium battery charger

Published:2011/7/15 4:22:00 Author:TaoXi | Keyword: Simple type, nickel cadmium battery, charger

If you open the switch K, the 220V AC city electricity will be transformed by the transformer B, then the current is rectified by D1-D4 to charge the two GNY0.5 type battery (Number five nickel cadmium battery), the current is 500mA. The light of D6 means it is charging, at this time, the open voltage of the TWH8778 switching integrated circuit's control electrode pin-5 is lower than 1.6V, the circuit can not be conducted, so D5 will not turn on. As the continuation of the charge, the charging current of the GNY battery decreases gradually, the port voltage of the battery increases gradually, the voltage of the TWH8778's control electrode pin-5 increases gradually too, when the voltage is equal to 1.6V, the circuit conducts, D5 turns on to indicate that the battery is full.   (View)

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Piezoelectric transducer of amplifier circuit

Published:2011/7/17 1:52:00 Author:Fiona | Keyword: Piezoelectric transducer, amplifier

Piezoelectric transducer of amplifier circuit is shown as above:   (View)

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Low drift peak detector circuit

Published:2011/7/17 1:50:00 Author:Fiona | Keyword: Low drift, detector

Low drift peak detector circuit is shown as above:   (View)

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Simple programmable charger circuit

Published:2011/7/15 3:54:00 Author:TaoXi | Keyword: Simple, programmable charger

This charger uses the electric fan program control manifold block BA3105, it masterly uses the timing and wind speed regulating function of the chip, and the current can be used as the charging timing current and the adjustment charging current. The timer can be set to 0.5-7.5 hours by the S2 which is as shown in figure 2-11; the speed adjustment function is switched by S3 of the figure 2-11, and the pin-1, pin-18 and pin-17 relatively output the high level respectively, every output pin controls different constant current source. When you are making the charger, the power can be supplied by 5W, 7.5V transformer.   (View)

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Analog multiplier circuit

Published:2011/7/17 1:47:00 Author:Fiona | Keyword: Analog multiplier

Analog multiplier circuit is shown as a bove:   (View)

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Accurate 12V storage battery automatic charger circuit

Published:2011/7/15 3:24:00 Author:TaoXi | Keyword: Accurate, 12V, storage battery, automatic charger

The principle diagram is as shown in figure 4-25, the secondary stage of the transformer is divided into two groups, L1 group is responsible for the charging, the light of LED1 means the rectifier power supply operating is normal. VS1 unidirectional thyristor is 6A, it uses the phase-shifting trigger circuit, you can change the phase angle by adjusting RP1 (change the charging current which flows through the VS1). The VS2 two-way thyristor is the passage-channel switch of the phase shifting trigger circuit. The L2 group is rectified, filted and stabilized to supply power to the IC1 to produce the trigger signal for the VS2, so VS2 is used as the phase shifting trigger circuit of VS1; on the other hand, it supplies to IC2 as the voltage comparator power supply.   (View)

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Fast half wave rectifier circuit

Published:2011/7/17 1:45:00 Author:Fiona | Keyword: half wave, rectifier

Fast half wave rectifier circuit is shown as above:   (View)

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Automatic charger circuit with the discharging function

Published:2011/7/15 2:34:00 Author:TaoXi | Keyword: Automatic charger, discharging function

This ciruit is simple and easy to make, the cost is low, and it has the function of charging status automatic conversion. Operating principle The circuit is as shown in figure 4-39. The whole circuit is divided into three parts: the discharging circuit, the charging circuit and the power supply circuit. The charging circuit and the discharging circuit are introduced in this article. The discharging circuit is composed of the op-amp IC1-b and the external components. The discharging current is decided by R6, the general discharge current is 1/5 of the battery capacity. The charging circuit is composed of the op-amp IC1-a and the external components.   (View)

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Precise AC and DC converter circuit

Published:2011/7/17 1:42:00 Author:Fiona | Keyword: AC and DC converter

Precise AC and DC converter circuit is shown as above:   (View)

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Low power integrated circuit test circuit

Published:2011/7/17 1:40:00 Author:Fiona | Keyword: Low power, test

Low power integrated circuit test circuit is shown as above:   (View)

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Differential input instrumentation amplifier circuit

Published:2011/7/17 1:37:00 Author:Fiona | Keyword: differential input, instrumentation amplifier

Differential input instrumentation amplifier circuit is shown as above:   (View)

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Variable gain differential input instrumentation amplifier circuit

Published:2011/7/17 1:36:00 Author:Fiona | Keyword: differential input, instrumentation amplifier

Variable gain differential input instrumentation amplifier circuit is shown as above:   (View)

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Simple charger circuit with the activation function

Published:2011/7/15 2:21:00 Author:TaoXi | Keyword: Simple charger, activation function

The circuit is as shown in figure 2-15. When L2 is in the positive half cycle, VD charges the GB; when L2 is in the negative half cycle, GB discharges, the voltage of GB and L2 are superimposed to charge C. When the positive half cycle comes again, the C discharges to charge the GB, so the power which is released by GB is utilized. When C is discharged, VD conducts to charge the GB. So repeatedly, the GB is fully charged. You can control the discharging of GB by change the capacity of C. The LED can be used in the working indication.   (View)

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The motorcycle anti-theft alarm (2)

Published:2011/7/19 19:21:00 Author:TaoXi | Keyword: motorcycle, anti-theft, alarm

The multi-function motorcycle anti-theft alarm is introduced in this article, and it can be used in the anti-theft applications of all the two-wheel motorcycles. The principle of the circuit The motorcycle anti-theft alarm circuit is composed of the mobile delay alarm circuit, the ignition switch ground wire break alarm circuit, the right cover vandal resistant alarm circuit, the control circuit, the alarm signal generating circuit and the power-saving circuit, as the figure 7-85 shows. The mobile delay alarm circuit is composed of the mercury switch Sl, the resistors Rl and R2, the delay capacitor Cl and the transistor Vl.etc.   (View)

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Battery charging regulator circuit

Published:2011/7/18 2:57:00 Author:TaoXi | Keyword: Battery, charging, regulator

This circuit uses the PHILIPS TEA1100 chip to charge the Nickel cadmium battery rapidly and effectively with the incremental peak principle. The circuit is as shown in figure 3-1. The incremental peak regulator can detect and judge the change of the battery voltage: if the voltage of pin-7 decreases 1% or more of the average maximum value, the charging will continue. The voltage of pin-7 must be in the range of 0.385V-3.85V, the voltage dividers R4 and R5 can be used to supply the voltage that is in this range. The values of R4 and R5 can be ensured by this formula: R4/(R4+R5)>0.35n. The charging current Io=1.25R10/R8IIR9)R2, the charging time t0=226X0.93XR2XC3. When the circuit does not detect the maximum voltage value, the circuit will stop charging after the time of T0.   (View)

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