Circuit Diagram

SWR_WARNING_INDICATOR

Published:2009/6/23 1:47:00 Author:Jessie

Op amp with dc input from SWR metercan be adjusted to preset the SWR reading at which the LED lights.   (View)

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CODE_PRACTICE_OSCILLATOR_1

Published:2009/6/23 1:46:00 Author:Jessie

Oscillator, works with 2 to 12 Vdc (but 9 to 12 volts gives best volume and clean keying). R1 can be replaced with a 500 K pot and the circuit wili sweep the entire audio frequency range.   (View)

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A SCR exchanging switch circuit diagram

Published:2011/7/28 2:53:00 Author:Ecco | Keyword: SCR , exchanging switch

The SCR is the switch of electrical equipment,which is used to conduct and cut off the electric, andit has the advantages of no contact beating and arc, small mechanical noise and radio frequency interference, high switching speed and small size. It's suitable for dangerous places with flammable gas which could cause explosion easily. The circuit is shown as the chart: It is a simple SCR exchanging switch circuit. When switch K closes, SCR turns on, the value of R generally selects thousands of Ω.   (View)

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REMOTE_RE_CURRENT_READOUT

Published:2009/6/23 1:45:00 Author:Jessie

A suitable pilot lamp is illuminated by a small sample of rf and energizes an inexpensive solar cell; the dc current generated by the cell is a measure of relative rf power, and may be routed to a low-current meter located at any convenient point. A sensitive, low-current pilot lamp is desirable to cause minimum dis-turbance to normal rf circuit conditions. The number 48 or 49, 60 mA lamp is suitable for use with transmitters above 1-watt output.   (View)

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MC33035 over-current protection circuit diagram

Published:2011/7/28 21:32:00 Author:Ecco | Keyword: over-current protection circuit

MC33035 overcurrent protection circuit is shown as the chart. MC33035 uses the external inverter to be grounded by resistor RS for the current sampling. Sampling voltage is input to the current sense comparator by pin 9 and pin 15. Inverting input of the comparator (pin 15) is set a 100mV reference voltage, which is used as the current limit ing benchmark. In the oscillator sawtooth rising time, if the current is too large, the comparator will flip so that the next RS flip-flop resets and closes the driven output to limit the current from continuing increase.   (View)

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Temperature controller circuit diagram 4

Published:2011/7/28 21:44:00 Author:Ecco | Keyword: Temperature controller

The temperature controller 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 switch s, power transformer T, bridge rectifier UR, filter capacitors C1 ~ C3, three-terminal voltage regulator integrated circuit IC1, resistor R2 and power indicator LED VL1. Temperature detection control circuit is composed of the temperature detection diode VD1, resistors R3 ~ R1O, operational amplifier integrated circuit IC2 (N1 ~ N3) and the potentiometer RP. R1 ~ R12 select the 1/4W metal film resistors. RP uses a linear potentiometer. C1 selects the aluminum electrolytic capacitor with voltage in 25V.   (View)

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SELF_POWERED_CW_MONITOR

Published:2009/6/23 1:44:00 Author:Jessie

Position L near the transmitter output tank to hear the key－down tone。Then tape the coil In place. C＝.047μF，R＝8.2 K，Q＝HEP 253(or equal)，T＝500：500 ohm center tapped transformer. L = 2 to 6 turns on 1/2'' coil from.   (View)

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OUTPUT_TO_CURRENT_CONVERTER

Published:2009/6/23 1:44:00 Author:Jessie

Occasionally, it is preferable to generate a cur-rent, rather than a voltage, output into the load.The availability of differential inputs aJlows this to be accomplished in any of the four basic modes.If the output is to integrated, ZL can be sim-ple high-quality capacitor, unloaded by an op amp connected as a high-impedance follower.Note that, if desired, one side of a rest switch can be grounded.The compliance constraint for this configura-tion, where VL is an arbitrary common-mode po-tential, is: |VL+IOUT(ZL+RS)|≤12V   (View)

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VARIABLE_FREQUENCY_ASTABLE_II

Published:2009/6/23 1:43:00 Author:Jessie

This circuit uses a single potentiometer and switched capacitors to cover 2 Hz to 30 kHz。   (View)

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KIA Maxima Sedan ABS Circuit

Published:2011/7/17 23:48:00 Author:Felicity | Keyword: KIA Maxima Sedan, ABS Circuit

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ASTABLE_OSCILLATOR_II

Published:2009/6/23 1:43:00 Author:Jessie

By using transistor switch Q1/R2/R3, the frequency of an astable oscillator can be changed with a dc voltage or logic level.   (View)

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KIA Maxima Sedan Automatic Transmission Circuit (the 2nd)

Published:2011/7/17 23:52:00 Author:Felicity | Keyword: KIA Maxima Sedan, Automatic Transmission Circuit, (the 2nd)

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AUTOMATIC_TAPE_RECORDING

Published:2009/6/23 1:42:00 Author:Jessie

Amateurs don’t haveto missthe action while away from the tug．This circuit turns on a tape recorder whenever the recelver’s squelch IS broken. After signal loss， the recorder will shut off following a slight delay.   (View)

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CURRENT_TO_VOLTAGE_CONVERTER_FOR_GROUNDED_LOADS

Published:2009/6/23 1:42:00 Author:Jessie

This circuit uses an Analog Devices AD830 video difference amplifier. The circuit consists of two differential inputs. Unlike a conventional op amp, the AD830's output is nulled when the sum of the differences of the two inputs is zero.The AD830's stated unity-gain bandwidth is 60 MHz, and the device is capable of driving up to ±30 mA directly. The differential input voltage is limited to ±2V, while the maximum power supply is ±15 V.If more output current is desired, the AD830 can drive a bipolar transistor (such as an MJE200) directly. This will produce a one-sided output.A ferrite bead can be placed on the base to prevent oscillation under some conditions. Com-pensation can be added by splitting RS, and adding a variable capacitor. A resistor can be po-sitioned at the input to match the amplifier's in-put to a transmission line.   (View)

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CODE_PRACTICE_OSCILLATOR

Published:2009/6/23 1:41:00 Author:Jessie

This simple cpo uses the 7404 low-power Schottky hex inverter. C is a 5- to 30-μF electrolytic selected for the desired pitch. The speaker is a 2-inch, 8-ohm unit.   (View)

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ASTABLE_OSCILLATORI

Published:2009/6/23 1:41:00 Author:Jessie

In this circuit，two gates from the quad 4093 package are used to form a simple astable squarewave oscillator.The values for RX and CX are approximately as follows∶These values can be scaled for other frequencies.   (View)

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KIA Maxima Car Cooling System Circuit

Published:2011/7/18 0:01:00 Author:Felicity | Keyword: KIA Maxima, Car Cooling System, Circuit

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KIA Maxima Car Engine Circuit (the 4th)

Published:2011/7/17 23:59:00 Author:Felicity | Keyword: KIA Maxima Car Engine Circuit (the 4th)

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PREAMP_TRANSMIT_RECEIVE_SEQUENCER

Published:2009/6/23 1:41:00 Author:Jessie

This circuit is useful in amateur radio VHF and UHF work where a mast-mounted antenna preamp is used for receiving. The kit controls T-R switching and change-over relay sequencing so that high RE levels are prevented from accidentally being applied to the preamplifier during switching intervals.   (View)

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KIA Maxima Car Engine Circuit (the 3rd)

Published:2011/7/17 23:58:00 Author:Felicity | Keyword: KIA Maxima, Car Engine Circuit, (the 3rd)

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