Circuit Diagram

Buck_converter_with_lown_quiescent_current

Published:2009/7/25 2:05:00 Author:Jessie

This circuit provides 5-V output for 8- to 16-V input, with about 10-mA quiescent current.   (View)

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HEADPHONE_AMPLIFIER

Published:2009/6/28 23:34:00 Author:May

Can be used with FM tuner in place of more expensive audio am-plifier. For stereo, use one LM386 circuitfor each channel. Can be mounted directly on headphones if weight of battery is not objectionable.-J.A. Sandler, 11 Projects under $11,Modem Electronics, June 1978, p 54-58.   (View)

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PHASE_COMPARATOR

Published:2009/6/28 23:34:00 Author:May

High-level reference or carrier signal and low-level reference signal are applied to multiplier inputs of Exar XR-S200 PLL IC. If both inputs are same frequency, DC output is proportional to phase angle between inputs. For low-level inputs, conversion gain is proportional to input signal amplitude. For high-level inputs (VS above 40 mVRMS), conversion gain is constant at about 2 V/rad.— Phase-Locked Loop Data Book, Exar Integrated Systems, Sunnyvale, CA, 1978, p 9-16.   (View)

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Norton_fast_op_amp_with_JFET_input

Published:2009/7/25 2:04:00 Author:Jessie

This circuit combines a Norton with a P-channel JFET to procDuce.a fast op amp. External compensation capacitance CC is required to accommodate u any additional phase shift at the input. Figure 11-21B shows circuit performance for various values of CC.   (View)

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74 Series digital circuit of 74LS324 VCO (dual-phase output with controlling)

Published:2011/8/1 20:11:00 Author:Lucas | Keyword: 74 Series, digital circuit , VCO, dual-phase output , controlling)

Output frequency is determined by the external components; it can works in the frequency of 30 ~ 120Hz; if the input is added 2V voltage in the frequency controlling range, the output frequency is approximately 0.0001CEXT , and there is complementary out.   (View)

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35_W

Published:2009/6/28 23:34:00 Author:May

Signetics 540 drives complementary output transistors to give high output current for driving 8-ohm loudspeaker. Feedback is adjusted to give AC gain of 40 dB. Gain rolls of to unity at DC to prevent DC offset voltages from being amplified to level that might damage loudspeaker circuit. Power limiting is provided by placing resistor network around output stage.- Signetics Analog Data Manual, Signetics, Sunnyvale, CA, 1977, p 762-763.   (View)

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5__to_±15_V_converter_with_low_quiescent_current

Published:2009/7/25 2:04:00 Author:Jessie

This circuit provides±15 V at 100 mA, with only 10-mA quiescent current (IQ).   (View)

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RPM_LIMIT_ALARM

Published:2009/6/28 23:31:00 Author:May

Used with capacitor-discharge ignition system to provide tachometer output along with engine speed control signal. When breaker contacts open, C1 charges and turns Tr1 on, triggering 555 timer used in mono MVBR mode, Resulting positive pulse from 555 fires control SCR through D6 and C6. When contacts dose, D2 isolates C1 to reduce effect of contact bounce. With values shown, for speed limit between 8000 and 9000 rpm, use 0.068 μF for C4 with four-cylinder engine, 0.047 pF for six cylinders, and 0.033 μF for eight cylinders; LED across breaker contacts can be used for setting static timing.-K. Wevill, Trigger Circuit for C.D.l. Systems, Wireless World, Jan. 1978, p 58   (View)

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Norton_bi_quad_filter

Published:2009/7/25 1:47:00 Author:Jessie

This circuit shows both sections of a dual Norton used to form a bi-quad filter. Figures 11-15B and 11-15C show the design equations and bias equations, respectively. Note that the basic circuit can be connected to provide three types of filter action. With type I, VO1 is a band-pass, and VO2 is a low-pass. With type II, VO1 is high-pass and VO2 is band-pass. With type II, VO1 is notch or band-reject, and VO2 is not used. Note that one section of the Norton is connected as a noninverting integrator (Fig. 11-14), and the other section is inverting. The circuit provides satisfactory operation up to about 2 MHz.   (View)

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74 Series digital circuit of 74LS3237 dual voltage-controlled oscillator(single-phase output)

Published:2011/8/1 1:25:00 Author:Lucas | Keyword: 74 Series , digital circuit , dual voltage-controlled oscillator, single-phase output

Two independent voltage-controlled oscillators; external components can determine the output frequency; it works in any frequency between 0.12 and 30MHz.   (View)

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Boost_or_CUK_inverting_dc_dc_converter

Published:2009/7/25 1:45:00 Author:Jessie

This circuit inverts the output (negative out for positive in) and either steps up or steps down in the input. Typical performance data, switching waveforms, and component source information are given in Figs. 4-34B, 4-34C, and 4-34D, respectively.   (View)

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POWER_AMPLIFIER_WITH_ERROn_TAKEOFF

Published:2009/6/28 23:31:00 Author:May

Voltage proportional to distortion is amplified for use in reducing nonlinear distortion at output, in circuit developed for use as single-ended power amplifier. Power Darlingtons are MJ4000 and MJ4010, and both opamps are 741, Preset 5K pot is adjusted initially for minimum distor-tion. Artide gives theory of operation and design equations,-A. M. Sandman, Reducing Amplifier Distortion, Wireless World, Oct. 1974, p 367-371   (View)

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Step_up_＋6_Vdc_to_48_Vdc_at_90_mA

Published:2009/7/25 1:43:00 Author:Jessie

This circuit converts 6-V to a 48-V（adjustable）output．   (View)

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VARIABLE_WINDOW

Published:2009/6/28 23:30:00 Author:May

Single comparator can be programmed for wide variety of applications. One reference input voltage positions center of window, and other sets width of window. Sum or difference of reference voltages must not exceed ±10 V; if larger voltages must be handled, add voltage divider to scale them down into comparison range. A1 is subtractor, generating voltage Eb - Ea for use as lower limit voltage. Lower limit is added to 2Eb at A2 to derive upper Iimit voltage Eb + Ea.－W. G. Jung, IC Op-Amp Cookbook, Howard W. Sams, Indianapolis, IN, 1974, p 232-233.   (View)

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74 Series digital circuit of 74LS363 octal D flip-flop(tristate)

Published:2011/7/25 3:48:00 Author:Lucas | Keyword: 74 Series , digital circuit , octal D flip-flop, tristate

Edge-triggered D flip-flop; the minimum Voh level is 3.65V; 74LS374 is similar with the circuit, but the typical minimum VOH is 2.4V. Q0 = the output level before establishing the steady-state input conditions.   (View)

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HIGH_GAIN_IC_WITH_TRANSISTOR

Published:2009/6/28 23:30:00 Author:May

High Inputimpedance of RS741C opamp permits use withany general-purpose crystal microphone R2 is volume control,and R3 controls gain and frequency response of IC Power transistor stagedrives loudspeaker directly without outputtransformer、-F M、Mims,″Integrated Circuit Proiects、vol，6、″Radio Shack,Fort Worth,TX,＇1977 p 79-88   (View)

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74 Series digital circuit of 74LS364 octal D flip-flop(tristate)

Published:2011/7/25 3:45:00 Author:Lucas | Keyword: 74 Series, digital circuit , octal D flip-flop, tristate

Q0 = the output level before establishing the steady-state input conditions. Edge-triggered D flip-flop; the minimum Voh level is 3.65V; 74LS374 is similar with the circuit, but the typical minimum VOH is 2.4V.   (View)

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_Single_inductor_5_V_to±15_V_converter

Published:2009/7/25 2:01:00 Author:Jessie

This circuit converts 5 V to±15 V at 25 mV、withouta transformer,and with only one ilnexpenslve inductor .   (View)

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Norton_low_noise_amplifier

Published:2009/7/25 2:00:00 Author:Jessie

The programmability of a Norton and the ability to shut off thenoninverting input current mirror can be used to Improve nolse characteristics. For an inverting application, where the noninverting input would only be used for bias, an alternate biasing scheme (the nVBE biasing) can be used as shown in Fig. 11-20A. This allows shutting off the input current mirror, which, in itself, reduces input noise by a factor of two. Also, the input-stage programming current can be increased to further reduce the noise voltage at the expense of an increase in input noise current and low-frequency 1/f noise (which is generally not a problem in low-input-impedance wideband amplifiers). The typical effect on noise versus input-stage current is shown in Figs. 11-20B and 11-20C.   (View)

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The light dependent tube detection circuit

Published:2011/7/21 2:49:00 Author:Seven | Keyword: light dependent tube, detection circuit

The high-speed isolator computing amplifier circuit of sensor OPA404 Function: used in photoelectric detection, medical devices, sonar and ultra-sonic detection and other areas.   (View)

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