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Serial regulating circuit with adjustable output voltage

Published:2011/4/13 2:46:00 Author:Nicole | Keyword: serial regulating, output voltage

Serial regulating circuit with adjustable output voltage
The output voltage of this circuit can adjust from 0 to the maximum continuously. The datum quantity is the constant current circuit which is charged by auxiliary power supply. The reference current can be adjusted by 500Ω trimming resistor, the value is about 7mA. The current flows 2.5kΩ potentiometer and forms a voltage drop, its value is from 0 to maximum output, then the output voltage UA can be adjusted between 0 and the maximum. (View)

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Data-controlled variable frequency oscillator

Published:2011/4/14 3:25:00 Author:Ecco | Keyword: Data-controlled, variable frequency , oscillator

Data-controlled variable frequency oscillator
As shown, toaccess 11-bit binary data(highlevel is 1 , low level is 0 )on the base bias circuit of VT1~VT11, there are 2048 combinations. When one pointis in low level, the corresponding VT tube is conducted, the C2 charges through the RA + R2. RAis the equivalent resistance of the resistor connecting to each conducting tube. (View)

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Integrated regulated power supply circuit with output voltage can be adjusted to 0.5V

Published:2011/4/13 2:48:00 Author:Nicole | Keyword: regulated power supply, output voltage

Integrated regulated power supply circuit with output voltage can be adjusted to 0.5V
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Multivibrator with symmetric wave output

Published:2011/4/14 3:40:00 Author:Ecco | Keyword: Symmetric wave , output, multivibrator

Multivibrator with symmetric wave output

The chart is as shown. Comparing with the general multivibrator, it adds a biased transistor VT1 to the charging circuit. VT1 can be fully conducted in the effect of R2; When C1 discharges, it will be completely closed. As the forward resistance is low(less than hundreds ohm) when VT1 switch and germanium diode arein the conducting state, it has little influence on charging and discharging time. Another advantage of this circuit is thatthe loading change has a minimal impact on the output voltage amplitude, duty cycle and oscillation frequency. (View)

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Double output regulated power supply

Published:2011/4/13 2:49:00 Author:Nicole | Keyword: double output, regulated power supply

Double output regulated power supply
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Double tracking regulated power supply

Published:2011/4/13 2:51:00 Author:Nicole | Keyword: Double tracking, regulated power supply

Double tracking regulated power supply
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Power supply circuit used in TTL circuit

Published:2011/4/14 3:39:00 Author:Nicole | Keyword: Power supply, TTL

Power supply circuit used in TTL circuit
This circuit can be used to provide TTL integrated circuit with power supply. Potentiometer Rp =1kΩ is used to adjust output voltage, normally, it is 5V. The regulator tube is used to provide reference voltage. The main technical details: input voltage: U1=220±10%V, 50Hz; output voltage: U2=5V; adjustable range of output voltage: 0.7~7V; the max output current:I2=2A; noise voltage: U<2mV; transformer turns: n1=1550 turns, 0.25mm enameled copper wire, n2=72 turns, 1.4mm enameled copper wire. (View)

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Sequenced flashing AC flash lamp circuit

Published:2011/4/12 21:45:00 Author:Nicole | Keyword: AC flash lamp

Sequenced flashing AC flash lamp circuit
Q3, Q4, Q5 circuit form ring counter, the control leve of three terminal TRIAC Q5~Q8 is its load. Three incandescent lamps are sequenced flashing, normally only a lamp flashing at a time. Pulse frequency can be adjusted, the speed of changing lamp is 0.1~8/s. If adding the circuit of dashed box, the first light will not be extinguished when the next light flashing. (View)