DIGITAL BIOMETRICS INC
SC 13D, 1996-10-25
COMPUTER PERIPHERAL EQUIPMENT, NEC
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                   Under the Securities Exchange Act of 1934
                              (Amendment No. 1)*



                           Digital Biometrics, Inc.
________________________________________________________________________________
                               (Name of Issuer)


                    Common Stock, par value $.01 per share
________________________________________________________________________________
                         (Title of Class of Securities)


                                   253833107
        _______________________________________________________________
                                (CUSIP Number)


                              Charles H. Winkler
                          Citadel Limited Partnership
                          225 West Washington Street
                                   Suite 900
                               Chicago, IL 60606
                                (312) 696-2102
________________________________________________________________________________
(Name, Address and Telephone Number of Person Authorized to Receive Notices and
                                Communications)


                               October 23, 1996
        _______________________________________________________________
            (Date of Event which Requires Filing of this Statement)


If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [_].

Check the following box if a fee is being paid with the statement [_]. (A fee is
not required only if the reporting person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7.)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

                                                               Page 1 of 5 Pages
<PAGE>
 
                                 SCHEDULE 13D
- -----------------------         
  CUSIP NO. 253833107
- -----------------------                        
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
           Citadel Limited Partnership               
           FEIN No.: 36-3754834                              
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [X]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 
- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4         AF
      
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
      TO ITEMS 2(d) or 2(e) [_]
 5    
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6         U.S.
     
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7         Reporting person has voting and dispositive 
     NUMBER OF                 power over (i) 8% Convertible Debentures which 
                               are convertible into 653,820 shares of Common
      SHARES                   Stock, par value $.01 per share, as of the 
                               date of the filing of this statement and (ii)
                               74 shares of Common Stock, par value $.01 per
                               share.
   BENEFICIALLY    -----------------------------------------------------------
                          SHARED VOTING POWER
     OWNED BY        8         -0-
                          
       EACH                      
                   -----------------------------------------------------------
    REPORTING             SOLE DISPOSITIVE POWER
                     9         See item 7 above.
      PERSON              
                         
       WITH        -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
                     10        -0-
                                 
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11         See item 7 above.
      
      
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12                  
      [_]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13         5.73% as of the date of the filing of this statement. (Based on 
           10,761,997 shares of Common Stock issued and outstanding as of 
           July 31, 1996, plus the shares of Common Stock referred to in item 
           7 above.)
                  
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14         PN
      
- ------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
         INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
     (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

                                                               Page 2 of 5 Pages
<PAGE>
 
     This Schedule 13D is being filed in order to amend and restate in their
entirety any and all prior filings by the reporting person with respect to the
securities of the issuer set forth on the cover page hereto. The reporting
person desires to disclose in this statement the formula pursuant to which its
deemed beneficial ownership of the issuer's common stock may be determined as of
any date based on fluctuations in the market price of the issuer's common stock.

ITEM 1.  SECURITY AND ISSUER

     This Schedule 13D relates to shares of common stock, par value $.01 per
share ("Common Stock"), of Digital Biometrics, Inc. ("Issuer") that are issuable
to Nelson Partners, a Bermuda exempted general partnership ("Nelson"), and
Olympus Securities, Ltd., a Bermuda corporation ("Olympus"), upon conversion of
8% Convertible Debentures ("Convertible Securities"), held by Nelson and
Olympus. The principal executive offices of the Issuer are located at 5600
Rowland Road, Minnetonka, Minnesota 55343.

ITEM 2.  IDENTITY AND BACKGROUND

     This Schedule 13D is being filed by Citadel Limited Partnership, an
Illinois limited partnership ("Citadel"). Citadel's principal business office is
located at 225 West Washington Street, 9th Floor, Chicago, Illinois 60606.

     During the last five years, Citadel has neither been convicted in a
criminal proceeding (excluding traffic violations or similar misdemeanors) nor
party to a civil proceeding of a judicial or administrative body of competent
jurisdiction pursuant to which Citadel either became subject to a decree or
final order enjoining future violations of, or prohibiting or mandating
activities subject to, federal or state securities laws or was found in
violation of federal or state securities laws.

ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

     Citadel is the managing general partner of Nelson and the trading manager
for Olympus. The funds used for purchases reported herein are from the accounts
of Nelson and Olympus. Citadel has no beneficial ownership interest in any of
the funds or other property of Nelson or Olympus, except for Citadel's interest
as managing general partner of Nelson.

     Nelson and Olympus acquired an aggregate of $2,000,000 of Convertible
Securities pursuant to Subscription Agreements between each of Nelson and
Olympus and the Issuer dated as of October 3, 1995 ("Closing Date").

ITEM 4.  PURPOSE OF TRANSACTION

     The purchases reported herein were made as an investment. Citadel may, in
the future, recommend or make additional purchases or sales of the Convertible
Securities or Common Stock on behalf of Nelson or Olympus.

     Citadel has no present plans or proposals which would relate to or result
in transactions of the kind described in paragraphs (a) through (j) of Item 4 of
Rule 13D-101 of the Securities and Exchange Commission. However, Citadel
reserves the right to adopt such plans or proposals, subject to applicable
regulatory requirements, if any.

ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER

     (a)  By reason of its serving as managing general partner of Nelson and
          trading manager of Olympus, Citadel may be deemed to be the indirect
          beneficial owner of the Convertible Securities and the shares of
          Common Stock into which the Convertible Securities are convertible.
          As of the date of the filing of this statement, Nelson and Olympus
          collectively owned Convertible Securities for which they originally
          paid $1,550,000 ("Stated Value") and 74 shares of Common Stock.

          As of any date ("Conversion Date") all or a portion of the Convertible
          Securities may be converted into the number of shares of Common Stock
          determined by dividing  the Stated Value of such securities (plus an
          amount equal to 8% interest on the Stated Value of such securities
          from the Closing Date) by a conversion price ("Conversion Price").
          The Conversion Price is equal to the lesser of (i) $7.00 ("Fixed
          Conversion Price") and (ii) 85% of the average closing bid  price (as
          reported by NASDAQ or such other market or exchange as the Common
          Stock is then traded) of the Issuer's Common Stock for the five
          trading days immediately preceding the Conversion Date ("Floating
          Conversion Price").

                                                               Page 3 of 5 Pages
<PAGE>
 
          If the Company's Common Stock is trading at a price less than $8.24,
          the Conversion Price will fluctuate depending upon the closing bid
          price of the Issuer's Common Stock.  As a consequence, the number of
          shares of Common Stock into which the Convertible Securities may be
          converted, and consequently the number of shares of such securities
          which Citadel may be deemed to beneficially own, may fluctuate on a
          daily basis based solely on the Common Stock's market price and
          without any action taken by Citadel, Nelson or Olympus.

          As of the date of the filing of this statement, by virtue of its
          status as the managing general partner of Nelson and the trading
          manager for Olympus, Citadel may be deemed to be the beneficial owner
          of 653,894 shares of Common Stock representing 5.73% of the Issuer's
          Common Stock (based on (i) 10,761,997 shares of Common Stock issued
          and outstanding as of July 31, 1996 (as set forth in the Issuer's most
          recently filed 10-Q) and (ii) a Conversion Price equal to $2.5713).

     (b)  Citadel has the sole power to vote and the sole power to dispose of
          the Convertible Securities and the Common Stock into which the
          Convertible Securities are convertible on behalf of each of Nelson and
          Olympus.

     (c)  The following transactions with respect to the Issuer's common stock
          have been effected during the 60-day period ending October 22, 1996:

<TABLE>
<CAPTION>
Transaction Date   Transacting Party   Transaction  Quantity  Price
- ----------------   -----------------   -----------  --------  -----
<C>                <S>                 <C>          <C>       <C>
10/22/96           Nelson              Sell            7,700   3.02
10/21/96           Nelson              Sell           15,000   3.04
10/17/96           Nelson              Sell           18,000   3.00
10/16/96           Nelson              Sell           13,000   3.12
10/11/96           Nelson              Sell            5,000   3.41
10/10/96           Nelson              Sell           10,000   3.25
10/10/96           Nelson              Sell           12,600   3.38
10/9/96            Nelson              Sell            5,000   3.38
10/7/96            Nelson              Sell           10,000   3.56
9/30/96            Olympus             Sell              186   3.56
9/30/96            Nelson              Sell               94   3.56
9/13/96            Nelson              Sell            2,200   3.25
9/12/96            Nelson              Sell           10,000   3.25
9/10/96            Nelson              Sell            3,900   3.88
9/06/96            Nelson              Sell           10,000   3.94
9/05/96            Nelson              Sell            5,000   3.94
8/30/96            Nelson              Buy             2,500   4.38
8/30/96            Nelson              Sell            2,500   4.25
8/26/96            Olympus             Sell           30,000   4.56
</TABLE>

     (d)  Nelson and Olympus, as the direct beneficial and legal owners of the
          Convertible Securities, have the right to receive or the power to
          direct the receipt of dividends from, or the proceeds from the sale of
          the Convertible Securities and the Common Stock into which the
          Convertible Securities are convertible.  However, Citadel, as managing
          general partner of Nelson and trading manager for Olympus, ultimately
          has the right to direct such activities.

ITEM 6.  CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT
TO SECURITIES OF THE COMPANY.

     Nelson and Olympus have the right to receive any dividends from and the
proceeds from the sale of the Convertible Securities held by them.  As described
in Item 3 above, Citadel is the managing general partner of Nelson and the
trading manager for Olympus.  As a result, Citadel has the power to vote and
dispose of the Convertible Securities and the Common Stock into which the
Convertible Securities are convertible held by Nelson and Olympus.

ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS

     No exhibits are required to be filed as part of this Schedule 13D.

                                                               Page 4 of 5 Pages
<PAGE>
 
                                      SIGNATURE

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

Date: October 24, 1996                   Citadel Limited Partnership
 
                                         By:  GLB Partners, L.P.,
                                              its general partner

                                         By:  Citadel Investment Group, L.L.C.,
                                              its general partner

                                         By:  /s/Kenneth C. Griffin,
                                              ----------------------
                                              its manager

                                                               Page 5 of 5 Pages


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