motor speed control

Published:2013/1/22 21:14:00 Author:muriel | Keyword: motor speed, control

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classic lamp dimmer circuit

Published:2013/1/22 21:13:00 Author:muriel | Keyword: classic lamp , dimmer circuit

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The Current Source and Buffer

Published:2013/1/22 21:12:00 Author:muriel | Keyword: Current Source, Buffer

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Reference Voltage Buffer

Published:2013/1/22 21:10:00 Author:muriel | Keyword: Reference Voltage Buffer

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optional EIA-232 buffer

Published:2013/1/16 2:20:00 Author:muriel | Keyword: optional, EIA-232 buffer

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Automatic DC Motor Brake

Published:2013/1/7 21:12:00 Author:muriel | Keyword: Automatic, DC, Motor Brake

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Car Horn

Published:2012/12/24 21:21:00 Author:muriel | Keyword: Car Horn

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Tail/Brake Light Signal Cluster

Published:2012/12/21 21:28:00 Author:muriel | Keyword: Tail/Brake Light , Signal Cluster

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Car Battery Saver

Published:2012/12/21 21:27:00 Author:muriel | Keyword: Car Battery Saver

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Brake Light Signal Module

Published:2012/12/21 21:26:00 Author:muriel | Keyword: Brake Light , Signal Module

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Car Subwoofer Driver 2

Published:2012/12/21 21:26:00 Author:muriel | Keyword: Car Subwoofer Driver

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Sequential Turn Lights Driver

Published:2012/12/21 21:25:00 Author:muriel | Keyword: Sequential, Turn Lights, Driver

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Automotive Voltage Indicator

Published:2012/12/21 21:24:00 Author:muriel | Keyword: Automotive , Voltage Indicator

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Park-Aid Modification

Published:2012/12/20 21:17:00 Author:muriel | Keyword: Park-Aid Modification

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Park-Aid

Published:2012/12/20 21:16:00 Author:muriel | Keyword: Park-Aid

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Speed-limit Alert

Published:2012/12/20 21:16:00 Author:muriel | Keyword: Speed-limit Alert

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Motor Reversing Circuit

Published:2012/11/29 0:33:00 Author:muriel | Keyword: Motor Reversing Circuit

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Multi Rocket Launcher

Published:2012/11/21 1:58:00 Author:muriel | Keyword: Multi, Rocket Launcher

This launch controller can be used with low voltage battery igniters, which fire rocket engines in model rockets such as the Estes range. These circuits are electrical, only switches and contacts are involved.   (View)

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AGC circuit = Automatic gain control

Published:2012/10/11 2:22:00 Author:muriel | Keyword: AGC circuit

The automatic gain control circuit AGC provides a signal with less harmonics and additional amplification, between certain limits.As a result, it eliminates those intensity differences, annoying, and of speech music, which sometimes appear on radio and television.Field effect transistors T1 is used as a variable resistance. It’s value can vary from infinity to about 150Ω. It is in parallel with R3 and R4 together with, inducing the amplification of A1. Without FET, gainof A1 is about 20 dB. AGC Automatic Gain Control circuit diagram Amplification of A1 and A2 compensates damper losses: total agc circuit gain, with T1 blocked is 0 dB. Signals with a level lower than that set by P1 are amplified by a factor of maximum of 6.9 (= 17 dB amplification). AGC components list semiconductors D1 = 1N4148T1 = BF245CIC1 = TL072IC2 = TI071 Automatic gain control PCB   (View)

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Safe 12V Car Adapter circuit

Published:2012/9/26 21:17:00 Author:muriel | Keyword: 12V, Car Adapter

Safe 12V car adapter described here can be used to limit a +12 volt car battery current, available from the in-dash cigar lighter power port, to below 2.6 Amperes for use with portable electronic gadgets and travel chargers on long car journeys. This circuit will protect the car electric system against possible short circuits across the cigar power port.The 12 volts car adapter circuit is connected to the car +12V electric system via the cigar lighter plug J1. The +12V arrives on the board via a reverse voltage protection diode D1. Capacitor C1 decouples the input to the circuit. The current limited 12V output can be taken from the cigar lighter socket J2.Red LED (D2) is a simple power status indicator. After construction,boxed up the unit using a suitable ABS enclosure. Working of this electronic fuse is very simple. Usually,the mosfet switch T1 is driven via resitor R2 and the 12V from the car battery is available at the output jack J2. The current flow through sense resistor R1 produces a voltage drop,which is at a certain level will force transistor T2 to switch on. This in turn switches off T1 somewhat and the output supply current to the connected electrical load is reduced to prevent costly disasters. Note: Use a good quality heatsink for T1. Only for cars with negative ground only! 12 volts car adapter circuit diagram   (View)

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