Published:2011/4/2 4:34:00 Author:Nicole | Keyword: electron tube
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Published:2011/4/2 4:28:00 Author:Nicole | Keyword: power amplifier
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Published:2011/4/20 9:09:00 Author:Nicole | Keyword: electron tube
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Published:2011/4/20 9:08:00 Author:Nicole | Keyword: amplifier, audio power amplification
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Published:2011/3/30 3:28:00 Author:Nicole | Keyword: converter
The figure is a single-ended forward converter circuit composed of two transistors, diode clamped. VTl and VT2 is on/offsimultaneously by PWM pulse excitation. When they off, the voltage on N1 is polarity reversed, diodes VD3 and VD4 on, the potentialis clamped. Therefore, the voltage which is added to collector is equal to the input voltage Ui during the VTl, VT2 off.
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Published:2011/4/1 3:50:00 Author:Nicole | Keyword: single-ended switching power supply
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Published:2011/4/1 3:51:00 Author:Nicole | Keyword: ring switch
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Published:2011/4/1 3:50:00 Author:Nicole | Keyword: Condenser microphone, microphone
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Published:2011/4/1 3:57:00 Author:Nicole | Keyword: integrated circuit, radio
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Published:2011/4/1 3:57:00 Author:Nicole | Keyword: linear integrated regulator
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Published:2011/4/1 3:58:00 Author:Nicole | Keyword: integrated switching regulator
MAX639 series fixed / adjustable output multi-function integrated switching regulator circuit is an efficient, multi-function switching regulator circuit, the output voltage is +5 v, the input voltage is 5.5 ~ 11.5V, output current is 100mA. It is efficient, the electronic switch control terminal of the logic level control and the battery-side low-voltage detectionare havethe advantages of low-power, low dropout, multi-functional, it is widely used in portable instruments, meters and so on. The basic application as shown. The typical application circuit of voltage detection can be see as below.
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Published:2011/4/1 3:32:00 Author:Nicole | Keyword: switching regulator
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Published:2011/4/1 3:31:00 Author:Nicole | Keyword: output voltage circuit
MAX660 can be connected into two kinds of output voltage circuit: Voutl=Vin;Vout2=2Vin-1.4 V. Output resistance of this circuit is slightly larger, as shown.
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Published:2011/4/20 9:05:00 Author:Nicole | Keyword: switching power supply
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Published:2011/4/2 3:56:00 Author:Ecco | Keyword: digital circuit, double J - K negative edge, trigger
74 series digital circuit of 74107 74LSO7A double J - K negative edge trigger( with remove terminal)
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Published:2011/3/31 21:18:00 Author:Ecco | Keyword: digital circuit , double J - K , negative edge trigger
74 series digital circuit of 74LS113,74S113 double J - K negative edge trigger (with preset)
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Published:2011/4/2 3:55:00 Author:Ecco | Keyword: digital circuit , dual 4-bit latch
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Published:2011/4/2 3:55:00 Author:Ecco | Keyword: digital circuit, pulse synchronizer, pulse driver
74120 double pulse synchronizer/driver
It producesa single or a series of synchronous pulse with controlling function; Latch job promises that the output pulse won't be cut wave. High fan-outoutput complementary connects clock line drive system.
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Published:2011/4/18 20:14:00 Author:Ecco | Keyword: Dual D, flip-flop , VCO
The chart shows the dual D flip-flop VCO. Circuit outputs a 50% duty cycle square wave signal, while the consumption of current is very low. When the input voltage is 5 ~ 12V, the output frequency ranges from 20 ~ 70kHz. First assuming the initial state of IC-A is Q = low level. At this time, VDl turns off, Vi charges to Cl through Rl. When the voltage on Cl reaches a certain voltage level, IC-A is forced to flip, its Q output is in high level, Cl discharges through VDl. At the same time, the CL input of IC-A will be transformed into low level, IC-A is forced back to Q = low level. The delay effect of R2 and C2 discharges the electricity of C1 before the IC-A returning to the state of Q = low level. The narrow pulse current of IC-A triggers IC-B, it produces a 50% duty cycle output pulse signal.
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Published:2011/4/14 3:42:00 Author:Ecco | Keyword: 4h , Timing circuit
The figure shows 4h timing circuit which is composed of 556 dual time base circuit. To access N8281 divider network in the middle of 556 dual time base circuit, it will get a long time delay without large volume of capacitors. The first l / 2 (556) works in the way of oscillator, the period is l / f. It will produce the signal output in a N / f cycle to trigger the other half 1 / 2 (556) to add the output of oscillator to N divider network. It decides the total delay produced by the dividerto connect the divider to ⑧ pin of the second 1 / 2 (556) input terminal. Delay time is divided in 4 blocks of 30min, 1h, 2h, 4h. If connecting N8281 crossover in series additionally , the total amount of delay can be increased to days or even weeks.
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