L20 SE Audio Amplifier Board A1943 C5200 Stereo Dual Channels 350W Amp 4ohm DIY Kits 2pcs | Электроника

L20 SE Audio Amplifier Board A1943 C5200 Stereo Dual Channels 350W Amp 4ohm DIY Kits 2pcs | Электроника

Order guide:

Two channel kit: Two boards, two channels, DIY kit, you need to bring your own welding tools to assemble; Two channel finished: Two boards, two channels, finished board, welding and testing have been completed; Mono subwoofer: One board, mono, mono finished Bass gun for subwoofer.

L-20 SE simplified version pure post amplifier.

The L20SE I designed is a simplified version of the L20 amplifier. It has excellent control, ultra-low distortion, and wide voltage support range. High-power and high-current output load. There are 2 pairs of TOSHIBA A1943 C5200 per channel, with a current load of up to 20A. The voltage support range is wide, and two pairs per channel and four pairs of high-power tubes can be installed arbitrarily. The standard kit is 2 pairs of high-power tubes per channel. Power 200W8R, 350W4R, DC +-65V Parameter performance: The power supply range is DC + -15V DC to DC + -65V DC. The recommended DC voltage is +-40V, which is ideal for household use. It is recommended to use dual 15V to dual 40V transformer 200VA.

THD = (0.001%-0.002% 20HZ-20KHZ) 10W RMS 8 OHM SR= 35V /US Noise 92DBU EIN=114 DB Frequency response 10HZ-25KHZ +-0.02 DB

The voltage gain is 34 times. The quiescent current of the power tube is about 20MA per tube.

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Special version for subwoofer

20-200HZ -0.5DB 250HZ- 3DB 500 HZ-6DB Voltage gain 68 times, Quiescent current 0 MA Output power 200W 8R (+ -DC65V) Mono. ------------------------------------------ All resistors use precision copper feet 1% high-precision resistors, including high-precision output resistance. All capacitors are imported original Use Japanese original imported capacitors. ULTRA LOW ESR All small signal transistors use original ONSEMI TOSHIA transistors. Push tube and high-power tube adopt TOSHIBA TTA1943 TTC5200 And Toshiba A1930 C5171 audio dedicated imported original transistors. The kit has two boards, one board and one channel. L20 must use the original transistors, and do not change other brand models at will. The L20SE components can be used after being mounted on the PCB without any adjustment. Since the L20SE is a simplified version, it does not use the same PCB process as the L20. The L20 standard version uses the expensive PCB material process that thickens the state-owned enterprise. L20SE uses ordinary standard PCB technology, 1.6MM 1 OZ material, Taiwan manufacturer material, reducing cost and selling price.

Component drawing and size drawing:

Square wave test:

Output sine wave + -60V, load 6.6 ohm, output power 270W:

The transistors used are genuine and licensed original TOSHIBA ONSEMI, quality assurance: