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Loudspeaker Protection with Soft Start
Posted on Wednesday, November 17, 2010   •   Category: Amplifiers


This is a small protection circuit from loudspeakers, from DC voltage that likely to exist after some damage in the power amplifier. If a DC voltage is presented in the exit of amplifier, RL1 it interrupts immediately the line of loudspeakers preventing thus to reach in he. Parallel it provides a delay time of 3 seconds from the moment where the power supply will be applied. This delay protects the loudspeakers from undesirable bangs that are observed when open the supply switch.


TDA2030 Amp OTL 15W
Posted on Wednesday, November 17, 2010   •   Category: Amplifiers


Circuit of TDA2030 amp OTL 15W


HA1377 Bridge Amplifier BCL cap 17W (Car audio)
Posted on Wednesday, November 17, 2010   •   Category: Amplifiers


This is circuit Car audio Amplifier(Bridge Amplifier BCL) , It use IC HA1377, Supply Volt 12V-13V. Speaker 4 OHM. Nice Circuit and Easy to Build.


DC13.8V to DC250V Inverter Circuit
Posted on Wednesday, November 17, 2010   •   Category: AC / DC Innveters


I have done a lot of work with valves in recent years. For me valves have many advantages, least of all the price; since they are now "obsolete" it is quite easy to get hold of them for next to nothing at rally's and junk sales. I recently purchased a couple of hundred battery valves for less than SEK1 (US$ 0.15) each. The biggest problem with valves is the PSU needed to provide +250 vDC and 6.3 vAC for the filaments. The transformers are no-longer available at a reasonable price, but a pair of 12v-6v-0v-6v-12v mains transformers will do the job just as well. For portable use only one transformer is required together with a pair of power transistors such as 2N3055 etc.


FT232RL Arduino Programming Board
Posted on Monday, November 15, 2010   •   Category: USB Interface Adapters


This is simple FT232RL programming board for Arduino.


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