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25W amplifier module LM1875

Documentation in acrobat format (K50)

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Kit contains the essential components to build a HiFi amp module using the LM1875 IC. See the documentation for full specifications. Heatsink, speakers and cables are to be supplied by the user.

This kit contains the essential components needed to build a high fidelity amplifier module using the National Semiconductor LM1875 IC. With the addition of a handful of parts and a suitable power supply, this module will deliver 25W RMS into 8 ohms @ 1% THD. PCB dimensions are a tiny 53 x 50mm (2.1” x 2”). Heatsink, power transformer, speaker and cables are not included.(CPS50)
 
Quantity
Price
1 – 9$14.82
10 – 99$14.04
100 +$12.87

  (Kit - Basic Soldering Required)  
  CPS50  
  5  
 
 
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CPS50/K50 PCB only
 
(BB098)
Quantity
Price
1 – 9$5.70
10 – 99$5.40
100 +$4.95

  (Component or Part)  
  BB098  
  4  
 
 
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Dual Unregulated Power Supply
 
Four on-board 100V, 3A diodes plus 2200uF/50V electrolytics to provide an unregulated power supply from a center-tapped transformer. Many power amplifiers require a dual DC power supply for their operation. Usually this consists of some diodes and electrolytic capacitors to convert an AC voltage to a +/- DC voltage. This simple kit does just that, with all the components mounted on a small PCB to avoid the usual spaghetti-wired mass (mess?). The kit is constructed on single-sided printed circuit board. (CPS114)
Quantity
Price
1 – 9$13.11
10 – 99$12.42
100 +$11.39

  (Kit - Basic Soldering Required)  
  CPS114  
  5  
 
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Stereo Preamplifier - Tone Control Unit
 
This is a preamplifier and tone control unit
which will make a useful addition to any
of our power amplifier kits. It is extremely
easy to construct due to the use of a special IC,
the Philips TDA 1524A. This contains all the
circuitry required to provide up to 20 dB of
voltage gain, +/-15 dB of bass and treble
control, channel balance, and a switchable
loudness contour.
Specification
D.C. Input : 15V DC supply or 12V DC battery. 50 mA min.
Maximum output : > 3 V RMS
Maximum input : > 300 mV, G = 20 dB
> 3V RMS, G = 0dB. Input Z > 10 k ohm. Output Z < 300 ohm
Frequency resp. : < 10 Hz to > 50 kHz + / – 1 dB
THD at 1kHz : < 0.1 % at 1V output
S/N ratio : > 80 dB, G = 0 dB
Bass boost/cut ~ 15 dB at 50 Hz
Treble boost/cut ~ 15 dB at 15 kHz
PCB size: 4 inches x 2 1/4 inches. (CPS100)
Quantity
Price
1 – 9$23.26
10 – 99$21.60
100 +$20.88

  (Kit - Basic Soldering Required)  
  CPS100  
  3  
 
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50W amplifier module TDA7294
 
The heart of this amplifier module is a monolithic integrated circuit from SGS-Thomson, TDA7294. It is intended for use as an audio class AB amplifier in hi-fi applications. It has a wide voltage range and output current capability, enabling it to supply the highest power into both 4 Ohm and 8 Ohm loads. With the addition of a handful of parts and a suitable power supply, this module will deliver > 50W RMS into 8 Ohm @ 0.1% THD. HEATSINK NOT INCLUDED. User must supply a heatsink rated at 1.4 deg C/W.

Specifications (± 35V D.C. power supply)
Output power : > 50W RMS, 4-8 Ω load
~ 80W into 4Ω max.
~ 60W into 8Ω max.
Gain: 24 dB (30dB modification)
Input sensitivity : 1.3V for 50W, 8 ohm
0.9V for 50W, 4 ohm
(0.6V, 50W, 8Ω, G=30dB)
Input impedance : 10kΩ
Signal-to-Noise ratio : > 95 dB, (>105 dBA)
Frequency response : ~ 20Hz - 200kHz, –3 dB
Slew rate : > 10V/uS
THD : < 0.01%, 1W-40W,1kHz
< 0.1%, at 50W, 20-20kHz
IMD : < 0.01%, 1W

(CPS106)
Quantity
Price
1 – 9$31.01
10 – 99$28.80
100 +$27.84

  (Kit - Basic Soldering Required)  
  CPS106  
  9  
 
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audio amplifier 1W (LM386) kit
 
A kit module designed to be used as a building block in a larger project. The semiconductor LM386 is a general purpose power amplifier designed for use in low voltage applications. Gain may be set between 20 and 200. LM386 data sheet included. Supply voltage: 4 to 12V(CPS17)
PCB size: 1.5in x 1.25in (38mm x 31mm)
Quantity
Price
1 – 9$10.26
10 – 99$9.72
100 +$8.91

  (Kit - Basic Soldering Required)  
  CPS17  
  17  
 
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Preamplifier
 
A preamplifier to use with an electret or other microphone to boost the signal before feeding into an amplifier. Simple and easy to build. PCB Size: 1.75" x 1.25". Power supply: 6 to 12VDC (Electret microphone Included)
Quantity
Price
1 – 9$9.12
10 – 99$8.64
100 +$7.92

  (Kit - Basic Soldering Required)  
  CPS98  
  29  
 
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