PCB for modified Sulzer regulator - v.2, US $9.50 – Picture 0

PCB for modified Sulzer regulator - v.2, US $9.50 – Picture 1

PCB for modified Sulzer regulator - v.2, US $9.50 – Picture 2

PCB for modified Sulzer regulator - v.2, US $9.50 – Picture 3

PCB for modified Sulzer regulator - v.2, US $9.50 – Picture 4

Pcb For Modified Sulzer Regulator - V.2

US $9.50

Plovdiv, default, Bulgaria
Feb 12th

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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 D10 and D11 resp.) are fed by constant current sources (Q5, R13 and Q6, R16 resp.) which ensures constant currents via D10, D11 and hence their constant working points. 3. Reference voltage sources are placed on the right (stabilized) sides of the stabilizers which ensures much more lower noise over them. 4. Diodes D9, D12 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 163x70 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 bottom layer for best durability. Silk screen with parts layout is placed on the top of the PCB. PCB has following abilities: - 3 different types of power transformers can be mounted on it - 15 or 25 VA series of Talema's PCB mounting toroidal transformers, PL20-XX-130B series of Tamura and standard toroidal transformers with outer diameter not larger than 70 mm. - When power transformers with two primary windings are used, ability for choosing the input AC voltage 230/115 V is provided on PCB. - Places for main filter capacitors with different sizes - radial leaded with lead spacing 5 or 7.5mm and outer diameter 18 mm. max. - Places for rectifier diodes with different cases - DO41, SOD-57, DO-201. - Bleeder resistors R1, R2 and output resistors R7, R8 can be RM10 or RM15 lead spacing (depending on their desired power rating). - In case of higher output voltages series resistors R14, R16 ensure safety voltage drop over JFETs. - Output MOLEX connector has two terminals for positive, negative and ground outputs (if multiple consumers are to be attached to regulator). - different types of heatsinks can be mounted on PCB. All parts used are easily obtainable from big supplier stores (Mouser, Farnell, Digi-Key etc.) or via e-bay. Some measurements has been taken in order to verify schematic's capabilities. - Soundcard's noise with pickup shorted: - regulator with output voltage 18V, 40 Ohm load (450 mA load current). OpAmp tested: NE5534: - regulator with output voltage 18V, 40 Ohm load (450 mA load current). OpAmp tested: OP37: For the tests was used a 35VA toroidal transformer with two secondary windings, capacitors after bridge rectifiers - 1000 uF Nippon ChemiCon KZE, all other parts - standard inexpensive; souncard used - Creative Audigy2 ZS (PCMCIA version). As a conclusion can be said that due to the not so low soundcard's noise floor, in both measurements the noise readings was mainly these from the soundcard. Nevertheless, even with this setup it can be stated that at 450 mA load current the noise voltage is below 2uV (-114dB). Note that even with good old NE5534 (cheap nowadays), schematic and PCB show very well results. Of course, they can be even better if larger rectifier capacitors are used or parts are with better noise characteristics. And finally - as a reference, the measurements of a regulator with LM317 were taken. All other parts (transformer, rectifier diodes, filter capacitor, load resistors) are the same. On the picture below you can see spectrum of LM317 (TO220 body) loaded with 120 Ohm resistive load (approx. 140 mA consumption current). Note: the listing is for PCB only - pictures of assembled device is for information purposes only! The package will contain: - PCB: 1 pcs. Detailed schematic, Parts List and instruction for building will be sent via e-mail immediately after payment, so please make sure a working e-mail address is provided along with PayPal transaction. I always ship with Registered Airmail, so tracking number will be sent. 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".

Condition:

New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is applicable). Packaging should be the same as what is found in a retail store, unless the item is handmade or was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag. See the seller's listing for full details. ...

Country of Manufacture

Bulgaria