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Index 100

MC3361B circuit

Published:2011/11/11 2:10:00 Author:Ecco

MC3361B circuit
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MC3359 receiver circuit

Published:2011/11/11 2:10:00 Author:Ecco | Keyword: receiver circuit

MC3359 receiver circuit
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Classic tuner circuit

Published:2011/11/11 2:19:00 Author:Ecco | Keyword: Classic tuner

Classic tuner circuit
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The connection output interface circuit between SH Hall switch and DTL, TTL

Published:2011/11/1 21:49:00 Author:Ecco | Keyword: connection , output interface, Hall switch, DTL, TTL

The connection output interface circuit between SH Hall switch and DTL, TTL
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Dynamic scan display circuit

Published:2011/11/10 3:32:00 Author:Ecco | Keyword: Dynamic scan display

The circuit shown as the chart is thedynamic scan display circuitcomposed ofdecoder driver CD4511, beat generator CD4017, 7 roads ofDarlington drivers MC1413. LED1 ~ LED5 are five common cathode LED displays . (View)

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Relay status indication circuit

Published:2011/11/10 3:02:00 Author:Ecco | Keyword: Relay status indication

Relay status indication circuit
The relay has one or more sets of contacts, if one set of contacts'common port connect to the public power, and in the release state, the common port is connected to the normally closed contacts, then LED-R is red ; and in the pull-in state, the common port is connected to the normally open contact, then LED-G is green. (View)

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Digital hygrometer

Published:2011/11/7 19:12:00 Author:Ecco | Keyword: Digital hygrometer

Digital hygrometer mainly consists of the following circuits :(1 ) humidity / voltage conversion circuit; (2 ) humidity / frequency converter circuit; (3 )the circuit composed of LM331. (View)

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770FS monitor blueprint

Published:2011/11/3 2:25:00 Author:Ecco | Keyword: monitor blueprint

770FS monitor blueprint
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4-tube transmitter schematic diagram

Published:2011/11/11 2:19:00 Author:Ecco | Keyword: 4-tube transmitter

4-tube transmitter schematic diagram
Circuit Notes This circuit provides an FM modulated signal with an output power of around 500mW. The input Mic preamp is built around a couple of 2N3904 transistors, audio gain limited by the 5k preset. The oscillator is a colpitts stage, frequency of oscillation governed by the tank circuit made from two 5pF capacitors and the inductor. ( Click here for Colpitt Oscillator Resonant Frequency Equation.) Frequency is around 100Mhz with values shown. Audio modulation is fed into the tank circuit via the 5p capacitor, the 10k resistor and 1N4002 controlling the amount of modulation. The oscillator output is fed into the 3.9uH inductor which will have a high impedance at RF frequencies. The output stage operates as a class D amplifier , no direct bias is applied but the RF signal developed across the 3.9uH inductor is sufficient to drive this stage. The emitter resistor and 1k base resistor prevent instability and thermal runaway in this stage. (View)