All posts in the 'Amplifier projects' Category
Posted on 18 Mar 2008
This amp is rated at 100W into a 4 Ohms load, as this is typical of a “combo” type amp with two 8 Ohm speakers in parallel. Alternatively, you can run the amp into a “quad” box (4 x 8 Ohm speakers in series parallel and will get about 60 Watts. For the really adventurous, 2 quad boxes and the amp head will provide 100W, but will be much louder than the twin. This is a common combination for guitarists, but it does make it hard for the sound guy to bring everything else up to the same level. [more]
Posted on 20 Feb 2008
This is a 300W bridged-paralleled power amplifier which use LM3886 x 6.This design uses a PCB to hold 3 paralleled LM3886s (i.e. PA150), and use the DRV134 to bridge 2 of the PA150 PCB boards. The function of DRV134 is to convert the un-balanced input signal to a balanced signal, so that the non-inverted signal is fed to one PA150.[more]
Posted on 02 Feb 2008
One more thing. Right now, if you have an unusual amplifier or if you wire your amp incorrectly to the power detector project, you could short out your amp’s power outputs. Before building the project, use a continuity tester or ohmmeter to make sure your amp’s black (ground) speaker connections are tied directly together (< 1Ω resistance) inside the amp, and make sure you wire the amp to the power detector correctly.[more]
Posted on 31 Jan 2008
This is a wide band amplifier cicuit which is suitable for the frequencies between 10MHz and 500MHz.Wide band amplifiers are used in communication receivers, RF measuring equipment and tons of other devices. The circuit described here uses a state of the art transistor to get maximum performance at high frequencies. It can be used as a low noise pre-amplifier due to his low noise characteristics. [more]
Posted on 31 Jan 2008
This SMD op-amp project uses the TI RC-4560 dual op-amp chip and a salt water-etched PCB. The builder got the op-amp as a free sample from Texas Instruments and scavenged all of the SMD resistors from old hard drive electronics. The results are not pretty, but they’re functional. The circuit used (with some changes) is the Chu Moy design found here. The CMoy circuit is not SMD. [more]
