Description
An alternative power supply for the Elektor Fortissimo-100 Power Amplifier
For those who object to a switch-mode power supply for the Fortissimo-100 Power Amplifier, this kit yields a linear, symmetrical, voltage regulator marked by low dropout voltage, high output current, and excellent stability – all obtained from discrete components.
Bearing in mind that nearly all high-performance audio power amplifiers benefit from a stabilized power supply, this linear power supply is specifically designed for a symmetrical output voltage of ±40 V and peak currents of 13 A (15 A peak achievable). As an example, the average current drawn by a Fortissmo-100 amp driving a 3 Ω load is 4 A per regulator.
Specifications
| Input voltage range | 52 V DC (low power usage) to 43 V DC |
| Output voltage range | approx. 38.9 V DC to 41.4 V DC (theoretically)
38.6 V DC to 41.1 V DC (measured) |
| Dropout voltage at 6 A | 42 V |
| Dropout voltage at 9.5 A | 43 V |
| Dropout voltage at 13.5 A | 44 V |
| Max. current | 15 A peak (half sinewave), 4.8 A (average) |
| SOAR protection | 15 A at 45 V DC in |
| Ripple rejection | >60 dB (@ 5 A DC load) |
| No-load input current | 27 mA (@ 52 V DC input) |
Included
- PCB
- All parts including heatsinks
