Another article that might help with bench power supply designs:
Current-Sense Amplifiers with Digital Output and 60V Common-Mode Range
- Offers easy interface with microcontrollers (supports 1.8V logic) by using digital outputs
- Delivers wide 60V common-mode range for robustness under fault conditions
- Includes internal op amp/comparator that allows flexibility in system design: the internal amplifier can be used to limit the inrush current or to create a current-source in a closed loop system; the comparator can be used to monitor fault events for fast response
High-side, current-sense amplifiers with 12-bit ADC and op amp/comparator - [Link]
I love the LM386. It’s a complete amplifier in an 8 pin DIP chip! All that is needed to build an audio amp are a few external components most of which are decoupling capacitors. It is well suited to low power applications and runs just fine on a 9 volt battery or any voltage supply from 4-12 volts. It has a low quiescent current drain of only 4mA so it won’t kill a battery right away if you leave it on and idle. The gain is internally set to 20 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. An increase in bass frequency can be facilitated by adding a 10K resistor and .033 uf capacitor in series between pins 1 and 5.
The 1/2 watt LM386 Audio Amplifier – [Link]
rsdio writes: This is a strange one. It claims to prevent clipping, but still appears to introduce distortion. Perhaps the idea is that soft clipping is preferred to hard clipping? If there were a voltage-controlled gain input, then true peak limiting would be possible, but this seems to trade one form of distortion for another. In any event, if you are interested in audio distortion circuits, then this article should certainly be interesting. [via]
To enable an audio amplifier to accommodate both loud and soft-spoken voices without clipping the loud waveforms, you can implement a nonlinear transfer function by adding a few components to a standard application circuit.
Simple circuit limits amplifier output - [Link]
The LM3875 is a popular amplifier with amateur amplifier builders. This calculator, designed for non-inverting gainclone amplifiers derives the gain given the resistor choices that you make.
Non Inverting LM3875 Gain Calculator - [Link]
This amplifier is based on the PA100 parallel amplifier detailed in National Semiconductor’s application note – AN1192.
Since my DIY speaker is 4-ohm and somewhat difficult to drive, I want to have a more powerful amplifier to match with it. Therefore I designed this amplifier which uses two LM3886 per channel, in parallel circuit. This amp can deliver about 50W into a 8-ohm speaker and 100W into a 4-ohm speaker. This is a stereo amplifier and therefore 4 LM3886s are used.
100W LM3886 Parallel Stereo Power Amplifier – [Link]
Today we did an project amplifier with LM386. This amplifier is very easy to make and very compact, works with a single power source whose value can be between 4V and 12V.It is based on the use of a type LM386 amplifier, capable alone to issue a power of several hundreds of milliwatts to a load (HP) of 8 ohms, while consuming only a few mA at rest. Ideal for make a small portable battery powered amp.For an application in stereo, just to build this amp in two examplaires.
Amplifier With LM386 - [Link]
One of the applications of 555 timers is a class D amplifier. In its most simplistic form it can be built with a single 555 and the 200mA current capability is enough to drive a small speaker, making it a good replacement for a low power amplifier. But I wanted more; I wanted to use it to build an amplifier that had enough power to allow listening to music in a small room. Adding a high power stage to a classical 555 class D amplifier was too easy, so I decided to build my own high power 555.
555 class D amplifier - [Link]
Here’s a Leach Amplifier based on 2SC5200 and 2SA1943 output power transistors that can provide up to 700W of power. The mechanical design is relatively simple, the transistors are placed on the two cooling profiles with a height of 66 mm, width 44mm, overall length 260mm. They are turned against each other Thus, from the cooling tunnel. Coolers are attaching the nylon backing which allows the assembly of transistors without washers, and thus better transfer of heat. DPS amplifier is at the top of the tunnel and the transistors are soldered from the bottom of PCB.
700W Leach Amplifier – [Link]
The amplifier design includes not only the final stage of the source (rectifier, filter) and protection against DC voltage output amplifier and speaker connections delayed. As already mentioned, the amplifier is designed as a single-module. This means that on one common board rectifier, filter capacitors, protection And definitely amplifier. Regarding the components of the external solution, the solution based on the original Mr. Marshall Leach.
275W Leach Amplifier – [Link]