The Gainclone. Introduction: Background Info: Construction Notes. Introduction. The model Gaincard from 47 Laboratories is a 25 Watt stereo amplifier. Check for Samples: LM The LM is a high-performance audio power LM to reduce the effects of PCB trace resistance and inductance. PCB for 56W Audio Amplifier using LM HiFi Amp. For LM IC. High quality FR4 double-sided, plated-thru and tinned holes, with conformal coating.

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I also compared it with a W x 6 home theater amp, and the home theater amp in stereo modewas able to reach higher volume without distortion, but they were very close in sound quality. Power cord is captive four pin molex, one per channel. The rest is a simple matter of deduction. It is understood that Kimura removed the film bypass caps C3 and C4, and R1 on the circuit will be replaced by the stepped attenuator.

The total cost of the project is a mere odd EUR so heck, why not? The left-channel audio signal is connected to the input, to resistor R2 act as set the impedance of circuit is 33K through the coupling capacitor C2. The non-inverting circuit shown here is, for better and for worse, the most faithful rendition of the original Gaincard possible given what was then publicly known about pvb.


There ,m3875 a way around this, though, involving using two chips per speaker.

For a given capacitance, a lower voltage power supply gives a softer, more relaxed sound. The amplifier can be used in the inverting mode, as well. The following is a suggested layout-schematic for the power supply: Figure 6 Figure 7 This project is simple to build and requires only basic knowledge of electronics, especially if prefabricated commercially available PCBs with silk screens are used.

Four FE5D diodes are used for rectification. In short, no excuses. You can also quadruple the power into an 8-ohm speaker.


This result is shown below:. All circuit grounds should meet at only one point i. Is used as a supply voltage to the IC power supply or amplifier circuit. Can be up-graded into a pair of complete mono amplifiers by adding another Model Power Humpty.

Gainclone LM PCB – Electronics Projects Circuits

The data sheets for the LM and its smaller cousin the LM are very informative. Before leaving Speaker shall pass to the zobel network circuit that include of R4 and Ocb To solve the problem with the load capacity and maintain stability at high frequency. Figure 2 Figure 3 Figure 4 The amplifier can be used in the inverting mode, as well.

To bypass the capacitors, just run a jumper for each of them. Furthermore, diodes D1, D3, D6 and D8 should then be omitted. Figure 1 The pins using of LM THD is lowest, as Figure 6 very good Frequency response. Both boards will be wired lm38755 parallel mode, and then the input to one of them will be inverted for more power.


If ran at a low voltage, it will be able to drive a 4-ohm load, though not well. It will be done soon though. Rather than connecting the ground to a speaker, you take the positive output of the resistors from one amp and connect them to each side of the speaker.

The brown lines are jumpers that lm33875 to be wired into the circuit. This site uses Akismet to reduce spam.

Gainclone LM3875 PCB

om3875 The power supply is very simple. Figure 2 the internal circuit in LM I preferred the two big bridges, which sounded more open and powerful, but clearly there is pbc to experiment.

Capacitors C1 to C4 are used for the filtration of the ripple voltage from the rectifier. Rigid and compact aluminum chassis construction to release vibrations smoothly. The DRV inverts and balances the signal so that one of two non-inverted amplifiers amplifiy an inverted signal, thus allowing bridge mode to work.

The wiring is done like this: