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Transistor Organ

Published:2012/12/12 0:27:00 Author:muriel | Keyword: Transistor Organ

Transistor Organ
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3 Watt FM Transmitters

Published:2012/12/12 0:26:00 Author:muriel | Keyword: 3 Watt, FM Transmitters

3 Watt FM Transmitters
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22 Watt Audio Amplifier 1

Published:2012/12/12 0:25:00 Author:muriel | Keyword: 22 Watt , Audio Amplifier

22 Watt Audio Amplifier 1
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Voltage Inverter II

Published:2012/12/12 0:23:00 Author:muriel | Keyword: Voltage Inverter

Voltage Inverter II
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Voltage Inverter

Published:2012/12/12 0:22:00 Author:muriel | Keyword: Voltage Inverter

Voltage Inverter
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Transformerless Power Supply 1

Published:2012/12/12 0:22:00 Author:muriel | Keyword: Transformerless, Power Supply

Transformerless Power Supply 1
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Solid State Tesla Coil/High Voltage Generator

Published:2012/12/12 0:21:00 Author:muriel | Keyword: Solid State, Tesla Coil, High Voltage Generator

Solid State Tesla Coil/High Voltage Generator
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Solid State Tesla Coil Circuit

Published:2012/12/12 0:20:00 Author:muriel | Keyword: Solid State , Tesla Coil Circuit

Solid State Tesla Coil Circuit
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Power Supply

Published:2012/12/12 0:19:00 Author:muriel | Keyword: Power Supply

Power Supply
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Portable CD Player Adapter For Car

Published:2012/12/12 0:19:00 Author:muriel | Keyword: Portable , CD Player Adapter, Car

Portable CD Player Adapter For Car
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30A dual channel schematic diagram

Published:2012/12/11 0:53:00 Author:Ecco | Keyword: 30A , dual channel

30A dual channel schematic diagram is shown as the figure. (View)

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The analog phase detector circuit diagram with 0.1 % gain accuracy

Published:2012/12/11 1:04:00 Author:Ecco | Keyword: analog phase , detector , 0.1 % gain accuracy

The analog phase detector circuit diagram with 0.1 % gain accuracy
It is composed of operational amplifier TLC072 and analog switch 74HC4053, but analog switch conduction resistance changes with temperature and power supply voltage. In the circuit, analog switch 74HC4O53 output is connected to a voltage follower composed of A3, therefore, conduction resistance does not affect the output. If the input signal source impedance is very low, you can not connect A1. 74HC series can not guarantee the picking up firstly, even if 74HC4053 makes A2 and A2 short-circuit, the additional resistors R1 and R2 prevent problem in the practical use. (View)

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The intelligent digital voltmeter circuit diagram composed of HI7159A and the 8031 microcontroller

Published:2012/12/11 1:06:00 Author:Ecco | Keyword: intelligent digital voltmeter, microcontroller

The intelligent digital voltmeter circuit diagram composed of HI7159A and the 8031 microcontroller
The internal circuit adopts the successive incremental integration, digital zero and low noise BIMOS advanced technology. Under 51 / 2 mode, the maximum count value is 199,999, and accuracy is ± 0.005 %. (View)

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The pre -stage circuit diagram of 6N7P bravery circuit

Published:2012/12/11 0:52:00 Author:Ecco | Keyword: pre -stage , bravery circuit

The pre -stage circuit diagram of 6N7P bravery circuit
The 6N7P is a common-cathode dual triode with good consistency, and it is used for the push-pull amplifier inverter circuit. This tube has the right characteristics, and it can work at zero gate voltage with mellow sound. In order to appreciate the 6N7P charm, people use 6N7P to form the dual channel pre-stage. And 1.5V battery can be used for gate bias, and the filament is supplied by DC power supply. The 6N7P working point current is 23mA. (View)

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Alarm circuit diagram using pyroelectric sensor

Published:2012/12/11 0:04:00 Author:Ecco | Keyword: Alarm , pyroelectric sensor

Alarm circuit diagram using pyroelectric sensor
The circuit is composed of amplifier, comparator and an output control part. According to Faraday's law, person's body temperature is about 37 ℃, radiation infrared wavelength is about 10μm, the pyroelectric sensor selects P7178 with 7 ~ 20μm sensitive wavelength range. A1 and A2 are selected low noise, low loss CMOS op amp μPC358, and it is connected to band-pass filter composed of RC to prevent the entry of the noise and error signal, extracting only a signal when the human body moves. A3 and A4 constitute a comparator. (View)