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LM4780 kit India
LM4780 kit India
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Old 28th November 2014, 06:19 AM   #1
diycomponents is offline diycomponents  India
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Join Date: Apr 2013
Default Amplfier kits and components India

Though LM4780 is a stereo ic it has been used in the parallel configuration, each amp board is monoblock. You would need two amplifier boards to make a stereo unit. Parallel configuration is used primarily to enable the amp to drive low impedance speakers i.e. < 8ohms comfortably as the load is shared between the two amplifiers built into the IC.
A very carefully desinged and high quality pcb is the heart of this amp. The pcb is star grounded as well as features a ground lift reistor for the signal stages, resulting in very quiet and hum free operation. The muting capacitor and resitor selection make for a silent turn on and turn off.
The amp performs exceptionally well and remains very cool when driving a pair of 6ohm book shelf speakers. It's sound quality belies the size and cost of the amplifier. When used with recommended transformer voltage i.e. 0-20,0-20 secondaries the amplifier will comfortably produce around 50 Watts RMS into 8 ohms and around 70 Watts RMS into 4 ohms speaker. Slightly higher secondary voltage will produce higher power when used with 8 ohms speakers, however it is not recommended to exceed 25 volts secondary voltages. The kit includes everthing needed to complete one board except heatsinks. A good heatsink would be 196MM/100MM unit available with us.

Click the image to open in full size.

Click the image to open in full size.

The PCB is slightly larger than a credit card.

Last edited by diycomponents; 4th December 2014 at 09:15 AM. Reason: forgot to add caption
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Old 28th November 2014, 06:24 AM   #2
diycomponents is offline diycomponents  India
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Join Date: Apr 2013
All capacitors excepting the muting cap are Panasonic FM's. All resistors 1%MFR and polyester film input caps. Kit includes everything needed to build the board except heatsinks and power supply board/transformers.
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