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Voice controlling music lantern circuit (3)

Published:2012/12/18 2:01:00 Author:Ecco | Keyword: Voice controlling , music lantern

Voice controlling music lantern circuit (3)
Transistor VT3 forms a main circuit of the lantern E, VT1 and VT2 form a control loop, the 220V AC is rectified by VD, Buck by R3, regulated by VS and filtered by C3 filter to output about 12V stable DC voltage for controlling the loop's power. Microphone B can pick up acoustic signal of indoor environment, then it convert it to electric signal which is amplified by the transistor VT1 level, then the amplified signal is flowing to the base of VT2 ( RP is a voice sensitivity adjustment potentiometer) by RP and C2. VT2 is connected into a non - biased emitter follower. (View)

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INA321/322 amplifier circuit diagram using feedback capacitor to improve dynamic characteristics

Published:2012/12/18 1:48:00 Author:Ecco | Keyword: amplifier , feedback capacitor , improve, dynamic characteristics

INA321/322 amplifier circuit diagram using feedback capacitor to improve dynamic characteristics
The both ends of the feedback resistor RF are connected to feedback capacitor CF in parallel, it is used to compensate for the feedback resistor, RG input equivalent capacitance and the effect on high - frequency signal from circuit board stray capacitance, so that the circuit has the best fast settling time. Output ( 6 feet ) end is connected to Rx, CL to reduce high-frequency noise, CIN is equal to INA321/322 input capacitance ( 3pF) and stray capacitance. RIN · CIN = RF · CF. (View)

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Basic connection diagram of INA326/327 signal and power

Published:2012/12/18 1:38:00 Author:Ecco | Keyword: Basic connection, signal , power

Basic connection diagram of INA326/327 signal and power
It selects most accurate 0.1μF capacitor for the power supply filtering, and it should be placed as close as possible to the chip power pin. Ro, Co are an output filters which can filter the output noise of circuit; at the same time, it can be used as the input filter for next-stage circuit, such as an input filter of analog - digital converter. The output voltage is based on the ground terminal of R2 / / C2 basis. (View)

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Tracking 0 ~ ± 15V regulator circuit diagram

Published:2012/12/18 0:30:00 Author:Ecco | Keyword: Tracking, 0 ~ ± 15V, regulator

Tracking 0 ~ ± 15V regulator circuit diagram
Working principle: the whole circuit is shown as the figure. The power input part is a common transformer buck bridge rectifier, increasing the capacitor filter can get ± 22V DC symmetrical voltage. Another two ± 6.8V auxiliary voltagea are also derived to add on IC4 and op amp IC3's V + and V-terminals to ensure that IC3 and IC4 working voltage does not exceed the limits. (View)

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Homemade eight-block digital regulated power supply circuit diagram

Published:2012/12/18 0:23:00 Author:Ecco | Keyword: Homemade, eight-block, digital, regulated power supply

Homemade eight-block digital regulated power supply circuit diagram
The circuit is divided into two parts, one part is the regulator circuit, the other part is a digital decoder circuit. Integrated regulator block is based on LM317 adjustable regulator to matched with the corresponding partial pressure resistor, then it can get eight blocks of voltage outputs. In order to reduce the power consumption of LM317, transformer uses the center tap. When the output voltage is below 9V, it uses 12V AC voltage; When the output voltage is above 12V, it uses 24V AC voltage, and the voltage is automatically switched by relay. (View)