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20 Seconds Voice Record/Playback Circuit with ISD1000

20 Seconds Voice Record/Playback with ISD1000

Description:

The ISD1000A is a Direct Analog Storage device which allows you to store 20 seconds worth of voice data on an IC chip which can be play backed anytime...

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Low Noise Pre-Amplifier for Dynamic Microphones

Description:

A low noise pre-amplifier suitable for amplifying dynamic microphones with 200 to 600 ohm output impedance...

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Low Distortion Headphone Amplifier with TDA2004

Description:

A opamp. medium power, here it's used as amplifier of headphones with possibility drive low loads. It contains in a nutshell two amplifiers. The voltage gain, has been determined in 40dB, from the R3-4 and R11-12, for each channel, respectively...

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Speaker Protection Circuit with LED Indicators

Description:

This is a small protection circuit from loudspeakers, from DC voltage that likely to exist after some damage in the power amplifier...

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