A
A simple 20w +20w amplifier with two way tone control ( only one channel of amp populated )
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A simple 20w +20w amplifier with two way tone control ( only one channel of amp populated )
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Thanks madhukannan for bringing me TIP 122/127 back into my mind.
TIP122 and TIP127 - found an old ultra low budget project from 1991 - 1992 ... the TL081 based amp worked several years until it retired into the "prototypes box". One TL081 has been cannibalized for another (can't remember) project 😆
The design was a bridged amplifier - maybe for a subwoofer. Forgotten ... theoretically it has had an output of about ~ 100W@4R with a +/-14V supply
Note the Motorola TIP122/127 😎
Have fun, Toni
TIP122 and TIP127 - found an old ultra low budget project from 1991 - 1992 ... the TL081 based amp worked several years until it retired into the "prototypes box". One TL081 has been cannibalized for another (can't remember) project 😆
The design was a bridged amplifier - maybe for a subwoofer. Forgotten ... theoretically it has had an output of about ~ 100W@4R with a +/-14V supply
Note the Motorola TIP122/127 😎
Have fun, Toni
Attachments
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Texas instruments PCM5242 chip. Balanced line out into INA1651 receivers, then single ended to the amplifiers. The balanced line usage and receivers is necessary to eliminate pops and clicks when changing tracks or stopping starting playback. There is no attenuation between the DAC and amplifer and the DAC itself controls the volume in "hardware". When the new TAD5242 comes out, I will be making a few versions. It appears that the TAD5242 is being developed to reduce pops and clicks within itself and may not need the INA receivers, the new mute will mute whenever nothing is being played. Not holding my breath on any of it, but the added S/N will be nice. Sorry took so long to reply
Lateral mosfet amp with error correction. The IPS/VAS is Borbely-Lender.
The protectiom and output coil are located on a separate board.
The protectiom and output coil are located on a separate board.
NIPPON CHEMI-CON KYB 1500uF/80V - local decoupling. The amp works very well even with SMPS.
yes they are Nippon chemi-con, but that Vent mark is also find on other caps brands too, Jamicon taiwan made and Sam-Young korean made and some Chinese made too, here in India I think keltron have same type vent mark
I have made some changes more or less for my diy class a se stereo amplifier and now i can happily tell you that sound is amazing and puzz and static noice is minimal but not completly silence. You barely notice it when you are in teh room, because amplifier fans are almoust noisiest part in the room, only when you get youre ears close the mid or tweeter then you hear static little hiss, not mutch more. In the listening position you never ever hear it.
And when music is playing i cant keep it never for full output volume, because volume db levels going too hight and there is no hearing distorsion even when giving some juice for the speakers with nominal listening levels and maybe sometimes some conditions little test for output a little 😀
Here is some picture with my amplifier and schematic what is not tell you everything details what i have been made, but it gives some information.
What do you think.
And when music is playing i cant keep it never for full output volume, because volume db levels going too hight and there is no hearing distorsion even when giving some juice for the speakers with nominal listening levels and maybe sometimes some conditions little test for output a little 😀
Here is some picture with my amplifier and schematic what is not tell you everything details what i have been made, but it gives some information.
What do you think.
Attachments
Finally after 4 years I finished the enclosure of my JLH 1969 . Wooden front panel oiled with white linseed oil, aluminum top, sides open for air exchange. Output BD911, 24V power supply, crc (25 000 uf, 1r, 25 000 uf for each channel.) Of course, it sounds good for such a simple circuit. THD 0.03% in the entire frequency range.
Attachments
These are the chassis for a pair of 500W monoblocks. I could not find a commercially available chassis of the desired dimensions, so these were built from scratch. The rear panel square cut-out and top/bottom panel ventilation slots were cut on a vertical mill. The aluminum front panel was bandsawed slightly oversized and then milled to the final dimensions. While horizontal fins on the heatsinks are not optimal for cooling, the heatsink area is more than sufficient to meet cooling demands. More photos to follow as the PCBs come in. When everything is assembled and working I'll disassemble the chassis and send it out to be painted or anodized.
Attachments
My little diy Class A single end stereo amplifier is now good condition even thought it is not ready yet.
But even this condition it is amazing amplifier.
Nominal Power is 6watt/channel@2ohm.
What is unusual is that my amplifier is NOT use global feedback to correct sound for speaker output so that why sound is only so good as it can be using outputstage local feedback.
Here is link for video what is recorded via mobilephone and quality is not give the best and live sound amazing feelings althought It give some info about it.
DIY Class A(7)
But even this condition it is amazing amplifier.
Nominal Power is 6watt/channel@2ohm.
What is unusual is that my amplifier is NOT use global feedback to correct sound for speaker output so that why sound is only so good as it can be using outputstage local feedback.
Here is link for video what is recorded via mobilephone and quality is not give the best and live sound amazing feelings althought It give some info about it.
DIY Class A(7)
Meterun Integrated Amplifier
SPECs
Dual mono class AB integrated amplifier
Quasi DC amplifier, here defined as coupling-cap-less and with sufficient tolerance to input signal DC offset, such that the offset is not amplified, while the audible low frequencies are preserved.
Independent power supply for each stage, thereby lowering the interference between stages
front-end topology: Multi-stage differential
power stage: Push-pull MOSFETs
Bandwidth:
MKIII: 4Hz-180KHz-3dB
MKIV: 2Hz-120KHz-3dB
Power per channel: 100W 8 ohms/195W 4 ohms
Input impedance: 47 Kohms
Output impedance:
MKIII: 0.05 ohms
MKIV: 0.03 ohms
Negative feedback: Limited amount
Noise level: Quiet as in deep sea
additional features: Delayed switch-on, instantaneous turn-off, speaker DC protection, electronic channel selection.
Input terminals: 4 x RCA
Output terminals: Banana plugs
Operable parts: Power switch, volume control, input channel selection
No remote control
Chassis: 430x450x130mm
Weight: 15kg
SPECs
Dual mono class AB integrated amplifier
Quasi DC amplifier, here defined as coupling-cap-less and with sufficient tolerance to input signal DC offset, such that the offset is not amplified, while the audible low frequencies are preserved.
Independent power supply for each stage, thereby lowering the interference between stages
front-end topology: Multi-stage differential
power stage: Push-pull MOSFETs
Bandwidth:
MKIII: 4Hz-180KHz-3dB
MKIV: 2Hz-120KHz-3dB
Power per channel: 100W 8 ohms/195W 4 ohms
Input impedance: 47 Kohms
Output impedance:
MKIII: 0.05 ohms
MKIV: 0.03 ohms
Negative feedback: Limited amount
Noise level: Quiet as in deep sea
additional features: Delayed switch-on, instantaneous turn-off, speaker DC protection, electronic channel selection.
Input terminals: 4 x RCA
Output terminals: Banana plugs
Operable parts: Power switch, volume control, input channel selection
No remote control
Chassis: 430x450x130mm
Weight: 15kg