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JLH Class-A Amplifier - The 1996 version using the specified transistors
with +/-22V supply rails and a quiescent current of 2A has an approximate rms
power output, into a resistive load, of 10W into 16ohm, 20W into 8ohm, 15W into
4ohm and 10W into 2ohm. For minimum distortion,....(Circuit design 08/08/08)
JLH Class-A Update - Tim is a professional musician (a classical concert
pianist) and so I trust his subjective judgement when it comes to assessing the
accuracy and realism of sound reproduction. Before Tim first contacted me, he had
built a kit version of the 1996 design, which he had....(circuit added 08/08/08)
Klauskorrektor I - The first phono stage ….….(electronic schematic added
03/08)
Klauskorrektor II - This regulated power supply was built as a
simplified outboard version of a PSU in my first phono stage. Replacing hexfreds
with tube rectifier eliminates the need for power-on sequencing. Chassis (salvaged
from a hospital laser PSU) size is 180W*240D*100H mm with a 125W double-C
core....(electronic design added 6/07)
KRELL KMA160 Class-A Mono Block Amplifier - KRELL KMA160 Class-A mono
block amplifier. The output power is 160 Watts for 8 Ohms and 320 Watts for 4
Ohms loudspeakers. ….(electronic schematic added 11/08)
Leach Superamp - Latest update of the "Low Tim Amplifier"
One amplifier builder found that the 2N5416 PNP transistors that he
purchased were NPN. I have tested them and verified this..... (added 4/02)
LF071 Mic Amplifier - A high quality microphone preamplifier
using a single power supply, suitable for dynamic or electret microphones.
The op-amp used can be any low noise, high performance type, e.g.
NE5534,TL071, OPA 371 etc [Designer, Andy Collison]
LM1875-20-W Audio Power Amplifier - Sometimes there is need to
convert line level signals to such signal that it can be connected to
microphone input. Because the line level signals are typically in range of
0.5..2V and the microphone signals are in millivolt range, ....(added
11/05)
LM386 0,325W Audio Amplifier - The LM386 is a power amplifier designed
for use in low voltage consumer applications. The gain is internally set to 20
to keep external part count low, but the addition of an external resistor and
capacitor between pins 1 and 8 will increase the gain to any value from 20 to
200. ….(electronic schematic added 11/08)
LM386 Audio Amplifier - This simple amplifier shows the LM386 in a
high-gain configuration (A = 200). For a maximum gain of only 20, leave out the
10 uF connected from pin 1 to pin 8. Maximum gains between 20 and 200 may be
realized by adding a selected resistor in series with the same 10 uF capacitor.
The 10k potentiometer will give the amplifier a variable gain from zero up to
the maximum. ….(electronic schematic added 11/08)
