Modified Sulzer regulator - mini version - fully assembled and tested

Description

Sulzer regulators are well known and proved their efficiency over the years. Schematic offered here is slightly modified two-polarity Sulzer regulator which has some improvements over original one:
1. Active regulation elements (opamps U1 and U2) are supplied by capacitive multipliers Q1, R3, C5 and Q2, R4, C6 for negative rail respectively.
2. Reference voltage sources (Zener diodes D11 and D12 resp.) are fed by constant current sources (Q5, R13 and Q6, R15, R16 resp.) which ensures constant currents via D11, D12 and hence their constant working points.
3. Reference voltage sources are placed on the right (stabilized) sides of the regulators which ensures much more lower noise over them.
4. Diodes D9, D10 ensure normal start of the two rails no matter what load is connected.
That schematic has very good capabilities (both simulated and measured) for ripple and noise suppression.
PCB for the schematic is with dimensions 87x90 mm.
PCB thickness: FR4 1.55 mm. Copper thickness: 35um (1oz). Surface finish - Nickel Gold (ENIG).
It is one-layer design with solder mask coating on both layers for best durability. Silk screen with parts layout is placed on the top of the PCB.
Regulators are assembled with following parts:
- Schottky diodes SB360.
- Medium power Darlington transistors BDX33C/BDX34C.
- High-speed OP Amps OP37.
- 10 000 uF EPCOS electrolythic capacitors.
- Low-noise 2SK117 N-FETs.
- Dipped tantalum electrolythic capacitors.
- 1% accuracy low-noise metal film resistors.
- Closely matched Zener diodes in both rails.
Regulator's measured performance with output voltage 15V, 40 Ohm load (375 mA load current):
For the tests was used a 35VA toroidal transformer with two secondary windings; souncard used - E-MU 0404.
The regulator is offered with the following standard output voltages: 9V, 12V, 15V, 18V, 24V.
Make sure to inform me for correct output voltage immediately after purchase.
Note
: Since the desired output voltage is adjusted with fixed value's resistors (in order to avoid any trimmers), some deviation from declared standard voltages is possible. Usually this is 10 - 15 mV max. The same apply for the voltages of both (positive and negative) rails: I do my best to achieve the perfect match between them but to be on a safe side I declare the max. difference of 10 mV.
In standard configuration regulator is built for use with two secondary winding transformer. If your transformer is with centertap secondary winding, let me know in order to arrange the PCB accordingly.
The package will contain:
-
1 pcs. assembled and tested PCB of modified Sulzer regulator preset to one fixed voltage.
Detailed schematic and instruction for wiring
will be sent via e-mail immediately after payment, so please make sure a working e-mail address is provided along with PayPal transaction.
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Combined shipping with other my items is welcome - just use "ask a question" at the bottom of the page or "request a total from seller".