555 Control Switch | Electronic Project Circuits

Posts Tagged ‘555 control switch’

Simple 12-180V boost converter using the 555 as controller

The most interesting aspect of the circuit is how an ordinary 555 is used to regulate the output voltage. Now, there are hundreds of switched mode controllers ICs on the market which are all better suited for this job than the 555. The problem with all these ICs is that if you build a nice NIXIE clock using them, and at one moment in the future the IC breaks down, it is more than likely that it is already obsolete and out of production. The 555 is (very) cheap, performs well enough and most likely will remain in production forever.

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Read More Source:http://www.dos4ever.com/flyback/flyback.html
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Be the first to comment - What do you think? Posted by admin - February 27, 2008 at 4:30 pm

Categories: DC converter, High voltage Tags: 555 control switch, boost converter, dc converter high voltage, high voltage

Drive SCR thyristor by IC 555

This circuit gives a burst of pulses to fire 2 SCRs, when pin 4 is taken to 12V the SCR is turned on, to use this circuit you need 12V short pulses phase shifted with respect to AC sine wave on bridge.

This way you can control the bridge from near 0% to near 100% ON, that way battery banks can be charged, electroplating can be done, current and voltage can be controlled with opamps, thyristors are very rugged compared to transistors and MOSFETS in that order.

Read More Source:http://www.electronics-circuits.com/schematics/arc20050612.html
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Be the first to comment - What do you think? Posted by admin - February 6, 2008 at 11:33 am

Categories: Electronic Control Tags: 555 control switch, Bounceless Switch, scr control circuit

Touch Switch ON-OFF by IC 555

The modern mechanic switches are improved concerning of old technology. We need however many times to replacement some old switch or to check currents bigger than the durability of certain switches or simple we need something with modern appearance. For he and different reasons is essential the up circuit. He is simple in the manufacture and the materials that use they exist everywhere. This based in the known 555, which drives a relay of which the contacts play the role of switch. The metal surfaces can have what form we want, but it should they are clean and near in the circuit. In order to it changes situation it suffices touch soft somebody from the two plates. Plate JF1 in order to the contacts of RL1 close [ON] or plate JF2 in order to the contacts of RL1 open [OFF]. The current that RL1 will check depended from his contacts. The Led D2 turns on when the switch they are in place ON and the contacts of RL1 closed.

Part List
R1-2=3.3M 1/4W 5% D1=1N4148 RL1=12V Relay [Your choise ]
R3=10K 1/4W 5% D2= Red LED 3 or 5mm. JF1-2=Metal Plate
R4=1K 1/4W 5% Q1=BC547
C1=10nF 63V MKT 5% IC1=555

Source: http://users.otenet.gr/~athsam/touch_switch_on_off.htm
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