SK18752 chip is only found in audio products produced in Japan, the most used is SONY company, and only a small amount is seen in Tianlong DENON. The SK18752 is much larger than the LM1875, and the package size is equivalent to the 5200. Because there is no official data, after repeated tests, it is calculated that the SK18752 chip's rated voltage should be around plus or minus 33V, and the output power is 30W @ 8Ω. The maximum working voltage can be up to plus or minus 40V (this voltage is not recommended), And its sound characteristics are bright in the middle and high frequencies, and good in low frequency. More to please people's ears. It should be that the Japanese did a special tuning process when developing these products with reference to LM1875, coupled with better semiconductor technology, in addition to using a LM1875 chip in a SONY amplifier, no one found any Japanese audio The product uses the US LM1875 circuit. (The LM1875 power amplifier board for SONY is attached to the back)
This circuit board refers to a power amplifier circuit of Tianlong DENON. In addition to using the op amp preamp, the circuit board is compatible with SK18752 and LM1875 chips. A new batch of SK18752 chips in stock in the brand-new original packaging has been purchased in this shop. The postscript at the time of purchase indicates whether you want SK18752 or LM1875.
Specification of the finished board:
1. Size: 140X62mm
2. Circuit working voltage: AC 12-22V (LM1875 version) / AC 12-28V (SK18752 version)
3. This board is a finished board that is installed and debugged, without radiator. Another main filter capacitor is genuine disassembled
4. The preamplifier is 5532