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Index 1725

The electronic valve difference common-gate phase-reversing circuit

Published:2011/6/20 22:01:00 Author:Seven | Keyword: electronic valve, common-gate

The electronic valve difference common-gate phase-reversing circuit is shown in theabove figure. (View)

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The sawtooth wave signal generator composed of DAC08EQ

Published:2011/6/14 4:16:00 Author:Borg | Keyword: sawtooth wave, signal generator

The sawtooth wave signal generator, which consists of DAC08EQ, is simply constructed, and the signal waveform of the generator is highly precise, the generator is used in highly precise signal waveform circuits or instruments. See as the figure. (View)

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The over-voltage auto power-down equipment setting circuit

Published:2011/6/19 0:49:00 Author:Seven | Keyword: over-voltage, power-down

The over-voltage auto power-down equipment setting circuit
The 220V mains provide with a stable 12V working voltage through C1, VD1 and DW1, and VD3, R2 and RP1 compose a voltage distributing sampling circuit. When the mains voltage is normal, DW2 is blocked, the working voltage on 5-pin of TWH8778 is lower than 1.6V, the relay J is open, the mains provides power normally after crossing the J-1 commonly closed touch spot; when the mains voltage is high than the normal value, DW2 is breakdown and conducting, LEV on 5-pin of TWH8778 is rising to 1.6v, which reverses IC, and the 3-pin outputs a high LEV, the relay is closed and the power supply of the electric apparatus is cut off immediately. (View)

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The temperature/pulse width converter circuit of 555

Published:2011/6/13 23:38:00 Author:Borg | Keyword: temperature/pulse width converter

The temperature/pulse width converter circuit of 555
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The voltage/frequency converter circuit of linear sawtooth wave (555)

Published:2011/6/13 23:37:00 Author:Borg | Keyword: voltage/frequency converter, linear sawtooth wave

The voltage/frequency converter circuit of linear sawtooth wave (555)
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The digit/time converter circuit of 555

Published:2011/6/13 23:35:00 Author:Borg | Keyword: digit/time converter

The digit/time converter circuit of 555
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The linear voltage/frequency converter circuit (555)

Published:2011/6/13 21:22:00 Author:Borg | Keyword: voltage/frequency converter

The linear voltage/frequency converter circuit (555)

frequency-voltage converting relationship: (View)

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The simple current/frequency converter (555)

Published:2011/6/13 21:19:00 Author:Borg | Keyword: current/frequency converter

The simple current/frequency converter (555)
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The voltage/frequency converter of low switching parameter (555)

Published:2011/6/13 21:18:00 Author:Borg | Keyword: voltage/frequency converter, switching parameter

The voltage/frequency converter of low switching parameter (555)
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The simple voltage/pulse width converter (555)

Published:2011/6/13 21:15:00 Author:Borg | Keyword: voltage, pulse width, converter

The simple voltage/pulse width converter (555)
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The triode voltage steady circuit

Published:2011/6/19 1:02:00 Author:Seven | Keyword: voltage steady circuit

The triode voltage steady circuit
The input voltage of the emitter output circuit is fixed at VZ, so the output voltage VO=VZ-VBE is also fixed. When the grid voltage is fluctuating, as VZ is almost still and VO is the same, the change of VI is adjusted by VCE, so the triode is called the adjusting pipe. When RL changes and it causes the fluctuation of IO, as lone as the △IZ is in the normal range of the stabilovolt tube, VZ will remains the same, i.e VO is almost stable. The fluctuation of the circuit output current can be expanded to （1+β）△IZ, so it is also called the enlarging voltage stable diode circuit. (View)

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The adjustable symmetric triangular wave generator circuit (555)

Published:2011/6/13 21:06:00 Author:Borg | Keyword: adjustable, symmetric triangular wave

The adjustable symmetric triangular wave generator circuit (555)
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The efficient step-up stable power supply consisting of MAX632

Published:2011/6/14 20:46:00 Author:Borg | Keyword: step-up, power supply

The efficient step-up stable power supply consisting of MAX632
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The linear sawtooth wave generator circuit of 555

Published:2011/6/13 21:01:00 Author:Borg | Keyword: linear sawtooth wave

The linear sawtooth wave generator circuit of 555
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The linear voltage/frequency converter circuit of 555 (4)

Published:2011/6/13 23:34:00 Author:Borg | Keyword: voltage/frequency converter

The linear voltage/frequency converter circuit of 555 (4)
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The machine tool magnetic sucker low-current protection circuit

Published:2011/6/19 2:47:00 Author:Seven | Keyword: machine tool, magnetic sucker, low-current

The machine tool magnetic sucker low-current protection circuit

See as the circuit, the +24V is generated by stepping down the 110V power supply. When the touch spot JK of the magnetic sucker circuit is closed, the sucker is on and working, whose regulated current is 1.4A(the current of strong sucker is higher). At the moment, the sampling resistor which is serially connected in the electric sucker will have a 1.4v voltage drop, the dropped voltage is sampled by the potentiometer RP1 and imposed on the transistor VT1 input circuit, and then compound-magnified by VT1 and VT2. The multiple after being compounded by VT1 and VT2 is high. (View)