SK25/SK99 Discrete Op-Amp - DIY Analog Pro Audio
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  • SK25/SK99 Discrete Op-Amp - DIY Analog Pro Audio

SK25/SK99 Discrete Op-Amp

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The SK25 and SK99 are discrete Op-Amps which are pin compatible with the API* 2520. They are low noise, high performance DOA's specially developed for audio applications.

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SK25/SK99

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The SK25 and SK99 are discrete Op-Amps which are pin compatible with the API* 2520. They are low noise, high performance DOA's specially developed for audio applications.

The SK25 will give its best noise performances with high impedance sources like high ratio input transformers (1:4 and above).

The SK99 will give its best noise performance with low impedance source, like low ratio input transformers (1:1 to 1:5) or transformerless input.

The switch from SK25 to SK99 is done changing by 3 resistors value. The SK2599 kit allows you to build any one of them.



Highlights

    • Pin compatible with API 2520 and “99” DOA's
    • 100% Class A with RL ≥ 600 Ω
    • Wide frequency range
    • Low noise, high speed, high gain
    • Very good stability
    • Wide supply voltage range from +/-15V to +/-24V
    • Rich quiescent current
    • Short circuit protected output
    • Available assembled or as a full kit (everything included)


What's in the kit?

Absolutely everything!

You bring the solder (use good quality solder, 1mm diameter max) and the Lunchbox.


Difficulty level

The SK2599 kit is not a kit for beginners because of the high density of components. It is recommended to people with some soldering experience.

PK002

Specific References


Technical specifications

SK25

Typical values measured with an HP8903A Audio Analyser, a Fluke 187 multimeter and a Tektronix 475 oscilloscope.
Measurement Conditions Value
Open loop gain @20Hz 118dB
Bandwidth Gain=+40dB
Deviation=-3dB
DC to 64KHz
Slew rate   5V/us
Input bias current   0.5uA
EIN Input resistor : 22Ω
Bandwidth=0-30KHz
1uV or -118dBu
Max output voltage Supply ±18V
RL=150Ω
23.5dBu
Peak output current   ±250mA
Supply voltage   ±15V to ±24V
Iddle current   20-25mA


SK99

Typical values measured with an HP8903A Audio Analyser, a Fluke 187 multimeter a Tektronix MSO2012 oscilloscope.
Measurement Conditions Value
Open loop gain @20Hz 120dB
Bandwidth Gain=+40dB
Deviation=-3dB
DC to 290KHz
Slew rate   25V/us
Input bias current   2.4uA
EIN Input resistor : 22Ω
Bandwidth=0-30KHz
-131dBu
Max output voltage Supply ±24V
RL=150Ω
25.6dBu
Peak output current   ±250mA
Supply voltage   ±15V to ±24V
Iddle current Supply ±24V 20-25mA

Documentation

SK25



SK99



Building Soundskulptor SK25 discrete op-amp

Reviews

Grade 
Sebb
12/19/2021

Vraiment compétent ce DOA!

Je l'utilise en application HI-Fi. Ce truc en reproduction audio est un vrai bijoux! Un son super naturel et agréable. Les mesures FFT le confirme! Bravo pour ce superbe produit!!

Grade 
JZero
10/25/2018

Good Sound/Easy Build

For now I have built 4 of them. Every time it gets a bit faster. I really love the sound of them. They are a little bit more mid-dy & lofi when compared to 99ers.

Write your review

SK25/SK99 Discrete Op-Amp

The SK25 and SK99 are discrete Op-Amps which are pin compatible with the API* 2520. They are low noise, high performance DOA's specially developed for audio applications.

Write your review