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LCD thermometer

Published:2012/12/6 1:13:00 Author:muriel | Keyword: LCD thermometer

LCD thermometer
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USB digital I/O extender

Published:2012/12/6 1:13:00 Author:muriel | Keyword: USB , digital I/O extender

USB digital I/O extender
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Electronic combination lock

Published:2012/12/6 1:12:00 Author:muriel | Keyword: Electronic combination lock

Electronic combination lock
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2^12 encoder

Published:2012/12/6 1:11:00 Author:muriel | Keyword: 2^12 encoder

2^12 encoder
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Learning IR remote control receiver

Published:2012/12/6 1:10:00 Author:muriel | Keyword: Learning IR , remote control , receiver

Learning IR remote control receiver
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Amplifier circuit for low frequency measurement

Published:2012/12/5 21:22:00 Author:Ecco | Keyword: Amplifier, low frequency measurement

Amplifier circuit for low frequency measurement
In order to accurately measure small amplitude AC voltage, the measuring circuit with operational amplifier is used. Operational amplifier NE530 can be used, the measurement frequency is more than 200kHz, so it can be used in the low frequency region. Measurement noise voltage can be ignored because it only has a few microvolts. Amplification factor 1 or 10 can be converted by the switch S on negative feedback branch circuit. When the amplification factor is 10, the amplification can be adjusted by potentiometer Rp. For example, if the input voltage is 100mV, you can adjust the output voltage to 1V. (View)

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Unijunction transistor working performance speed measurement circuit

Published:2012/12/5 21:30:00 Author:Ecco | Keyword: Unijunction transistor, working performance , speed measurement

Unijunction transistor working performance speed measurement circuit
Measured single-junction transistor VBT ( set: BT33) and R3, C2 form relaxation oscillator. When VBT gets conduction, transistor VT1 obtains bias current by the bias resistor R2 ( S1 is OFF, S2 is closed), the light - emitting diode H1 emits light. +10 V power supply charges for C2 by R3 and VD2. The voltmeter V measured voltage across C2 will rise over time, when the E terminal potential reaches peak voltage of VBT, the VBT's E to B1 will be automatically turned on. (View)

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Discriminant analysis methods for high - voltage capacitor

Published:2012/12/5 21:33:00 Author:Ecco | Keyword: Discriminant analysis methods, high - voltage capacitor

Discriminant analysis methods for high - voltage capacitor
As shown in Figure a), touching the capacitor lead end, if there is a strong spark generated, this capacitor is good; if there is no spark, this capacitor has been damaged or a minimum capacity. Figure b) is used to test the capacity of the capacitor. Read out the reading on the two tables of PA, PB, the capacitor capacitance can be obtained according to the following formula. C = 3180 * Ic / Uc, C (μF ) , Ic (A ) , UC ( V ). (View)

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Simple phase sequence indicator

Published:2012/12/5 21:36:00 Author:Ecco | Keyword: Simple , phase sequence, indicator

Simple phase sequence indicator

As shown in figure, as long as the X, Y, Z three lines are connected to three - phase circuit, the phase sequence of three - phase alternating current can be easily seen by the quenching of the neon tube light. If neon tube is lit , X , Y , and Z are respectively connected to A, C, B power supply phases. Conversely, if the neon tube is not lit, then the X , Y, and Z are connected to power supply A , B, and C phases. 1/8W carbon film resistors can be used, and the capacitor requires that the pressure to be greater than 400V. Neon can use neon fluorescent starter. (View)

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HA-5320 noninverting unit gain mode basic connection circuit

Published:2012/12/5 20:30:00 Author:Ecco | Keyword: noninverting unit, gain mode, basic connection

HA-5320 noninverting unit gain mode basic connection circuit
HA-5320 is used as a fast data acquisition A / D converting input stage, the input signal VIN is applied to pin 2 of HA-5320, after being sampling and holding amplified, it is sent to HI574A for analog - digital conversion, then it is converted to 12-bit digital signal output. S non / H signal can control the internal switch's turning on or off, i.e. sampling or holding state. If it needs to extend the hold time, it can be added the external keeping capacitor CEXT. (View)

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4/8-channel V4.2 infrared receiver

Published:2012/12/5 0:15:00 Author:muriel | Keyword: 4/8-channel, V4.2 , infrared receiver

4/8-channel V4.2 infrared receiver
The difference between the 4-channel and the 8-channel version is only the software inside. The 8-channel receiver outputs are individually configurable for latched or momentary output. The 4-channel receiver has two outputs per channel: K1-K4 are latched outputs, K5-K8 are momentary outputs for the four channels. The valid LED shows the transmitter activity. Make sure to turn on all address jumpers when the transmitter diodes are absent, or the J1-J4 jumpers are cut. Choose V+ supply voltage between +6-15VDC, based on the relay voltage ratings. For 6V relays, use +6VDC, for 12V relays use +12VDC. (View)

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4/8-channel V4.2 radio receiver

Published:2012/12/5 0:14:00 Author:muriel | Keyword: 4/8-channel, V4.2, radio receiver

4/8-channel V4.2 radio receiver
The difference between the 4-channel and the 8-channel version is only the software inside. The 8-channel receiver outputs are individually configurable for latched or momentary output. The 4-channel receiver has two outputs per channel: K1-K4 are latched outputs, K5-K8 are momentary outputs for the four channels. The valid LED shows the transmitter activity. Make sure to turn on all address switches when the transmitter diodes are absent, or the J1-J4 jumpers are cut. Choose V+ supply voltage between +6-15VDC, based on the relay voltage ratings. For 6V relays, use +6VDC, for 12V relays use +12VDC. (View)

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4/8-channel V4.2 infrared transmitter

Published:2012/12/5 0:12:00 Author:muriel | Keyword: 4/8-channel, V4.2, infrared transmitter

4/8-channel V4.2 infrared transmitter
The difference between the 4-channel and the 8-channel version is only the software inside. The 8-channel transmitter has one button (S1-S8) per channel. The 4-channel transmitter uses S1-S4 buttons to turn on, S5-S8 buttons to turn off channel 1-4 (use with latched outputs on the receiver). The D1-D4 diodes and J1-J4 jumpers are optional, and are used to setup the transmitter address. V+ supply voltage should be between 2.5-5.5VDC. It is practical to use two or three AAA batteries. (View)

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4/8-channel V4.2 radio transmitter

Published:2012/12/5 0:11:00 Author:muriel | Keyword: 4/8-channel, V4.2 , radio transmitter

4/8-channel V4.2 radio transmitter
The difference between the 4-channel and the 8-channel version is only the software inside. The 8-channel transmitter has one button (S1-S8) per channel. The 4-channel transmitter uses S1-S4 buttons to turn on, S5-S8 buttons to turn off channel 1-4 (use with latched outputs on the receiver). The D1-D4 diodes and J1-J4 jumpers are optional, and are used to setup the transmitter address. Higher supply voltage resultshighertransmit power, but V+ range is 2-5.5VDC for the PIC MCU. When V+ is higher than 5VDC, use separate power for the mcu. (View)