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555 transistor quality discriminator circuit diagram

Published:2011/8/4 5:02:00 Author:Ecco | Keyword: 555, transistor , quality discriminator

555 transistor quality discriminator circuit diagram
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Homemade MP3 player

Published:2011/8/1 3:04:00 Author:Ecco | Keyword: Homemade MP3 player

Homemade MP3 player
Description: This named yampp-7 MP3 player is palyed by a piece of Nokia3310 cell phone's LCD screen, and it uses a FT8U245 USB chip. A variety of flash cards and multimedia can be used the memory to store the songs. yampp7 is a new portable MP3 player that uses Compact Flash or MultiMedia cards for storage of songs. You ll get about 1 minute of playing time per MB on the memory card, if your songs are 128 kbps. The player is pretty small and the PCB has been designed to fit into a Teko Soap box. It features a 84*48 pixel graphical LCD display, similar to the displays used on Nokia 3310 cell phones. It s designed to operate from rechargable battery cells, either from a single 3.6V Li-Ion cell (recommended), or from 3*1.2V Ni-Mh cells. With a 600 mA Li-Ion cell, the playing time is about 12 hours, but you can find Li-Ion cells up to 1200 mAh that will fit in the player, extending the playing time to about 24 hours It s intended to be used with replacement Li-Ion cells for Mobile Phones, making it easy (and relatively cheap) to find a suitable cell. (I use mine with a cell for a Motorola V3688 Phone). It also features a USB interface for fast downloading of songs to the memory card, and for firmware updates The player uses a special filesystem called YADL (Yampp Advanced Disk Layout), which maximizes the capacoty of the memory card. It is playlist based and give the player a powerful but easy to use user interface Processor The central part of the yampp-7 player is the Atmel mega161 CPU. It s like a big-brother to the classic 8515 CPU that was used on the original yampp-3. It has 16 kB Flash and 1024 bytes internal SRAM, both double as much as on the 8515. It also features a bootloader option. This is been used in yampp-7, where it is now possible to download new firmware over the USB link USB The USB link is controlled by a FT8U245BM chip from FTDI. This is a VERY easy to use USB chip, which basically looks like a simple 8-bit buffer (hence the name). (View)

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M16 Experiment Board

Published:2011/8/2 1:18:00 Author:Ecco | Keyword: Experiment, Board

M16 Experiment Board

It includes the ISP, JTAG, 3310 LCD, and discrete parts RS232 serial port. When PC2-5 is not used as JTAG but IO port, it is designed to switch the situation to prevent the interference of JTAG, the design of Others, such as keyboards, LED, etc., they can be welded in the blank of experiment board. PCB diagram (it uses Protel dxp 2004 auto wiring. Thermal transfer legal board. The next picture shows the the circuit board after corrosion by ferric chloride and with thermal transfer layer and not beingsanding off ): (View)

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Toyota airbag circuit diagram

Published:2011/9/26 1:01:00 Author:Ecco | Keyword: Toyota airbag

Toyota airbag circuit diagram
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Toyota shift interlock circuit diagram

Published:2011/9/26 1:03:00 Author:Ecco | Keyword: Toyota , shift interlock

Toyota shift interlock circuit diagram
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Toyota electric lock circuit ( without security)

Published:2011/9/26 1:02:00 Author:Ecco | Keyword: Toyota , electric lock , without security

Toyota electric lock circuit ( without security)
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Toyota power supply circuit

Published:2011/9/26 1:04:00 Author:Ecco | Keyword: Toyota power supply

Toyota power supply circuit
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LMl872 logic box circuit

Published:2011/9/25 22:55:00 Author:Ecco | Keyword: logic box

LMl872 logic box circuit
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Power amplifier circuit of Marantz electronic valve 8

Published:2011/9/25 22:11:00 Author:Ecco | Keyword: Power amplifier , Marantz, electronic valve

Power amplifier circuit of Marantz electronic valve 8
Whole frequency response rangeis relatively flat from 10Hz to 40Hz. (View)

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Tube cathode-coupled inverter circuit

Published:2011/9/25 22:11:00 Author:Ecco | Keyword: Tube cathode-coupled inverter

Tube cathode-coupled inverter circuit
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Lightning protection circuit diagram for equipments

Published:2011/9/25 21:22:00 Author:Ecco | Keyword: Lightning protection , equipments

Lightning protection circuit diagram for equipments
When lightning occurs and generates the overvoltage, the over-voltage current can pass transient voltage between lines and ground to suppress diodes VD2, VD3 from connecting to the earth, and their ground voltage difference is further inhibited by the bipolar transient voltage suppression diode VD1 between two lines, so that the equipment is protected. (View)

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Tube partial-pressure inverter circuit

Published:2011/9/25 22:12:00 Author:Ecco | Keyword: Tube partial-pressure inverter

Tube partial-pressure inverter circuit
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Tube differential inverter circuit

Published:2011/9/25 22:14:00 Author:Ecco | Keyword: Tube differential inverter

Tube differential inverter circuit

Tube differential common-gate inverter circuit: (View)

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Tube SRPP inverter circuit

Published:2011/9/25 22:17:00 Author:Ecco | Keyword: Tube SRPP inverter

Tube SRPP inverter circuit

SRPP tube common-cathode inverter circuit: Tube SRPP common-gateinvertercircuit: (View)

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2A3A tube push-pull power amplifier circuit

Published:2011/9/25 22:26:00 Author:Ecco | Keyword: tube , push-pull , power amplifier

2A3A tube push-pull power amplifier circuit
2A3 is a low ESR and direct-thermal transistor, and the internal resistance is only 800Ω, so the output transformer primary screen load impedance needs 3.5kΩ. Push-pull power amplifier tube's screen voltage takes 360 ~ 380V, cathode-to-ground voltage is 60 ~ 80V, and the total operating current of amplifier is 80 ~ 100mA, the maximum output power is up to 15W. Local distortion factor is 1% to 2%, and frequency response is ± 2dB in the range of 20Hz ~ 40kHz. (View)