 Datasheet BC557 Philips
http://www.datasheetcatalog.org/datasheet/philips/BC556_557_3.pdf
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 Battery Equality Monitor
Almost all 24V power systems in trucks, 4WDs, RVs, boats, etc, employ two series-connected 12V lead-acid batteries. The charging system can only maintain the sum of the individual battery voltages. If one battery is failing, this circuit will light a LED.
http://circuits-projects.blogspot.com/2012/09/battery-equality-monitor.html
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 Electronic siren circuit
This circuit is suitable for in corporating with other alarm or siren projects such as burglar alarms, automatic factory sirens etc or a simple push to on alarm.
http://www.circuitstoday.com/electronic-siren-circuit
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 A very simple receiver by PA2OHH
"Barefoot" technology or simple, cheap and harmless technology. It was certainly not the intention to make a good receiver. No, the question was what you can receive with a very simple receiver with only one active component.
http://www.qsl.net/pa2ohh/05simrx.htm
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 High Power Siren
This article is all about a comparatively strong siren circuit useful for any purpose.A complementary transistor pair (BC 557 & 337) is arranged as an oscillator, directly drives the speaker.
http://www.circuitstoday.com/high-power-siren
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 Powerful Security Siren
This circuit was requested by several correspondents. Its purpose was to obtain more power than the siren circuit already available on this website (One-IC two-tones Siren) and to avoid the use of ICs.
http://circuits-projects.blogspot.com/2012/10/powerful-security-siren.html
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 Video amplifier splitter by transistor BD137-BC547-BC557
This is the video amplifier circuit or the video splitter circuit, it is designed to take video signal is stronger. Compensate for the loss of signal, and is video splitter video, which can connect up to three outputs. so is suitable for display on several television screens at the same time too.
http://www.eleccircuit.com/video-amplifier-splitter-by-transistor-bd137-bc547-bc557/
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