Circuit Diagram

FREEZER_MELTDOWN_ALARM

Published:2009/6/23 1:29:00 Author:May

The meltdown is a magnet held to a small stand by ice. A reed switch is below the magnet. When the ice melts, the magnet falls on the switch, closing it, and completing the alarm circuit.   (View)

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QUADRATURE_WAVE_OSCILLATOR

Published:2009/6/23 1:49:00 Author:Jessie

By using a high-frequency quad current-feedback amplifier (the HA5025) as an RC oscillator, four quadrature sine waves can be generated. The HA5025's four separate amplifiers generate the sine waves, and the quad NAND gate, U2, is biased at its threshold, so it acts as a sine-wave to square-wave converter when the she waves are ac coupled into its input.   (View)

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Liquid level automatic controller circuit diagram 6

Published:2011/7/28 20:40:00 Author:Ecco | Keyword: Liquid level , automatic controller

The liquid level automatic controller circuit is composed of the power supply circuit, level detection circuit and control implementation circuit, and the circuit is shown as the chart. Power supply circuit is composed of the knife switch Q, fuse FU, power transformer T, rectifier diodes VD1 ~ VD4, current limiting resistors R1 and R5, filter capacitor C1 and Zener diode VS. Level detection circuit is composed of the high-level electrode H, low-level electrode L and the main electrode M. Control implementation circuit is composed of the transistor V, relay K, time-base integrated circuit IC, diodes VD5 ~ VD8 and external RC components.   (View)

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SUBAUDIBLE_TONE_ENCODER

Published:2009/6/23 1:48:00 Author:Jessie

This twin-T oscillator produces six preset subaudible tones from 93 to 170 Hz in three ranges.   (View)

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SUN_POWERED_ALARM

Published:2009/6/23 1:29:00 Author:May

Circuit turns on when light (sunlight) strikes photocell. Potentiometer R sets light level at which the alarm sounds. Painted tube (black on inside) may be used on photocell to aim at the sun.   (View)

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DIRECT_CONVERSION_7_MHz_RECEIVER

Published:2009/6/23 Author:May

An NE602 is used to mix signals in the 7-MFlz range with an LO and to produce audio output.   (View)

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Temperature controller circuit diagram 2

Published:2011/7/28 21:37:00 Author:Ecco | Keyword: Temperature controller

The temperature controller circuit is composed of the power supply circuit, temperature detection circuit, reference voltage circuit, temperature indicator circuit, voltage comparator amplifier and control implementation circuit, and it is shown as the chart. Power supply circuit is composed of the power switch S, power transformer T, bridge rectifier UR, filter capacitors C1, C2, three-terminal voltage regulator integrated circuit IC2, current limiting resistor RIO and power indicator LED VL1. Temperature detection circuit consists of the transistor temperature sensor V1, resistor R1, capacitor C3 and N1 which is inside of the operational amplifier integrated circuit IC1 (N1 ~ N4).   (View)

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DIFFERENTIAL_VOLTAGE_TO_CURRENT_CONVERTER

Published:2009/6/23 Author:May

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Temperature controller circuit diagram 5

Published:2011/7/28 21:46:00 Author:Ecco | Keyword: Temperature controller

The temperature control circuit is composed of the power supply circuit, temperature detection control circuit and control implementation circuit, and it is shown as the chart. Power supply circuit is composed of the power transformer T, rectifier diodes VD1 ~ VD4, resistors R1 and R2, power indicator LED VL1, filter capacitor C1 and Zener VS and so on. Temperature detection control circuit consists of thermistor RT, time-base integrated circuit IC, potentiometers RP1 ~ RP4, resistor R3 and capacitors C2 ~ C4. Control implementation circuit is composed of the relay K1, LED VL2, diode VD5, AC contactor KM and electric heater EH.   (View)

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LATCHING_BURGLAR_ALARM_1

Published:2009/6/22 23:58:00 Author:May

Closing the Protective circuit(i.e.，R1 to R2) applies positive voltage to the gate ofSCR1 and sounds the alapy）. It can only be turned of with S1．   (View)

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SYNC_TO_ASYNC_CONVERTER

Published:2009/6/22 23:58:00 Author:May

This simple converter donsists of two ICs and a voltage regulator. The Sipex MAS7838, which acts as the converter, selects the conversion speed to that of the synchronized data clock. It has intemal switches and registers to perform the async-to-sync, or sync-to-async, conversion. The Maxim MAX238 provides the RS-232 drivers and receivers for interfacing with the data bus. These chips require a 5-Vdc power supply; a generic 78L05 reduces the +12V at the DB25 pin 9 to the +5V needed. A crystal fre-quency of 4.91MHz is suitable for convetting to 19.2 kbits or a sub-multiple (9.6, 4.8, 2.4, etc.). Two 1N4001 diodes protect the extemal RTS (ready to send) control circuitry if the RTS is enabled by S1.When JP1 is removed, the converter is transparent in the sync mocte and no conversion will occur.The completed unit is mounted atop a universal breakout adapter, and the control lines are jumpered according to the chart in the figure. The physical size is approximately 1 x 2.25 x 2.5 inches and will easily plug into the DB25 socket on a synchronized data communications equipment (DCE) communication device.   (View)

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GATED_2_kHz_BUZZER

Published:2009/6/22 23:56:00 Author:May

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5_V，5_A_STEP_DOWN_CONVERTER

Published:2009/6/22 23:56:00 Author:May

This circuit is useful where power must be distributed by a higher (10 to 60 V) bus. The circuit reduces power dissipation and elintinates inefficient passive linear regulators. The switching fre-quency is in the 100-kHz region.   (View)

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SCR_CONVERTER

Published:2009/6/22 23:55:00 Author:May

Two SCR devices are used in a push-pull driver to convert 28 Vdc to 155 Vdc, using the transformer and bridge shown. A center-tapped transformer with 24 V:120 V could be used for 60-Hz applications. The trigger circuit supplies a push-pull drive signal.   (View)

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Temperature controller circuit diagram 3

Published:2011/7/28 21:41:00 Author:Ecco | Keyword: Temperature controller

The temperature controller circuit is composed of the power supply circuit and temperature detection control circuit, and it is shown as the chart. Power supply circuit is composed of the power switch S, fuse FU, power transformer T, rectifier diodes VD1, VD2 and filter capacitor C. Temperature detection control circuit is composed of electric contact thermometer Q, relay K, AC contactor KM, diode VD3 and electric heater EH. C selects the aluminum electrolytic capacitor with the voltage in 25V. VD1 ~ VD3 select the 1 N4007 silicon rectifier diodes. K selects the JRX-13F orJQX-4F 12V DC relay.   (View)

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BURGLAR_ALARM

Published:2009/6/22 23:55:00 Author:May

  (View)

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SIMPLE_VARIABLE_FREQUENCY_OSCILLATOR

Published:2009/6/22 23:55:00 Author:May

In this variable audio frequency oscillator, the output of U1 at pin 2 is used to drive an 8-Ω speaker through R2 (which functions as a current-limiter).   (View)

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PIEZOELECTRIC_ALARM

Published:2009/6/22 23:54:00 Author:May

  (View)

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VARIABLE_DUTY_CYCLE_FROM_ASTABLE

Published:2009/6/22 23:54:00 Author:May

If R1=R2＝R3 and C1＝C2＝C3If potentiometer R3 is set at N％of rotation，thenTTOTAL≈0.7[（R+NR3）C+[R+[1－N）R3C]TTOTAL≈1.4 (R+R3)C and the duty Cycle can be varied without changing frequency.   (View)

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FET_QUARTZ_CRYSTAL_OSCILLATOR

Published:2009/6/23 1:48:00 Author:Jessie

This oscillator uses an MPF102 JFET as an active element.   (View)

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