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SK25/SK99 Discrete Op-Amp
$24.00
$24.00
VAT incl.
$24.00
VAT excl.
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
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
| DOCS Code | Documents |
| From DOCS-9 | Parts list Components layout Assembly guide Schematic |
| From DOCS-1 to DOCS-8 | Parts list Components layout Assembly guide Schematic |
SK99
| DOCS Code | Documents |
| From DOCS-9 | Parts list Components layout Assembly guide Schematic |
| From DOCS-1 to DOCS-8 | Parts list Components layout Assembly guide Schematic |
Building Soundskulptor SK25 discrete op-amp
Reviews
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.
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.
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!!