Pinout descriptions

  • I have some LL1515. What is it and how can I use it?

    LL1515 is a microphone input transformer with turns ratio 1+1:7 (200 ohm : 10k) The LL1515 is discontinued and no data sheet is available.
    For replacements, please study LL1530 or LL1576.

    Pin configuration (transformer seen from component side with label readable)
    
    4, 	3, 	2, 	1
    
        LL1515    
    
    8,	7,  	6,	5        
    
    LL1515 Usage (1:7)
    in+	   pin 1 + 3  
    in-	   pin 2+4  
    out+	   pin 6  
    out-	   pin 7  
    ground  pin 5
  • Is there a data sheet for the LL1518?

    No, I am afraid we have no data sheet for the LL1518. The LL1518 is a (solid state) line output transformer, similar to the LL1517.
    Usage:

    Turns ratio 1:1    
    In+		pin 1 (left bottom, if you read transformer label correctly)
    In-		pin 5    
    Out+		pin 7   
    Out - 	pin 10 (right top)  
    Connect	pin 6 + 9  
    Ground 		pin 8    
    Turns ratio 2:1    
    In+		pin 1 (left bottom, if you read transformer label correctly)  
    In-		pin 5    
    Out+		pin 7 + pin 9  
    Out - 		pin 10 + pin 6  
    Ground		pin 8
  • LL1521
    The LL1521B is a high impedance line input transformer, very similar to the LL1540 but with a slight stepup.

    Turns ratio 1 + 1 : 2.28

    Usage:    
    In+		pin 1	(left row, bottom pin when viewed from component side)  
    In-		pin 3  
    connect		pin 2 + pin 4    
    Out+		pin 5	(right row, bottom pin when viewed from component side)  
    Out-		pin 8  
    Shields		pin 6
  • LL2603
    The LL2603 is a small size line isolation transformer, similar to the LL1532
    Turns ratio 1ct : 1

    Usage:    
    In+		pin 1	  
    In-		pin 4  
    Centertap	pin 2    
    Out+		pin 6	  
    Out-		pin 7  
    Faraday shields	pin 5 + 8
  • LL2613
    The LL2613 is a small size microphone input transformer
    Turns ratio 1+1 : 10

    Usage:    
    In+		pin 1 (coil 1) and pin 4 (coil 2)  
    In-		pin 2 (coil 1) and pin 3 (coil 2)  
    Centertap	pin 2    
    Out+		pin 8	  
    Out-		pin 6  
    Faraday shields	pin 5
  • I have some LL2801. What are they used for and is there any datasheet available
    Sorry, but there is no data sheet for the LL2801

    LL2801 is a 600 ohm output transformer, turns ration 1:1  
    Core:	Radiometal lamination, ED style.    
    Usage:    
    in+	7  
    in-	6    
    out+	9  
    out-	10
  • LL2804
    LL2804 is yet a microphone input transformer with turns ratio 1+1:7 (200 ohm : 10k) The LL2804 is
    discontinued and no data sheet is available. For replacements, please look at LL1530 or LL1576.

    Pin configuration:  
    (Transformer seen from pin side. I am afraid I can not tell orientation, 
    as our notes are  incomplete and we have no samples left.)    
    4,    3,    2,    1       
    
       LL2804      
    
    8,    7,    6,    5       
     
    LL2804 Usage (1:7)  
    in+	pin 2  
    in-	pin 3  
    out+	pin 6  
    out-	pin 7  
    Housing 		pin 1  
    Core 			pin 4  
    Faraday shield 	pin 5+8
  • LL3802
    General purpose isolation transformer.
    LL3802 is a ”600 : 600 ohm” general purpose isolation transformer, turns ration 2:1+1 Core: Mu metal, ED style.

    Usage 1:1   
    in+	7  
    in-	9  
    out+	1  
    out-	5  
    connect 2 + 4  
    Faraday shield 10 + 6  
    
    Usage 2:1   
    in+	7  
    in-	9  
    out+	1+4  
    out-	2+5  
    Faraday shield 10 + 6
  • LL3803
    LL3803 is a very low impedance, high current output transformer

    2, 	                 	1        
    
           LL3803   
     
    5,        4,        	3   
    
    LL3803 Usage (1 : 1.1)  
    in+	pin 1  
    in-	pin 2  
    out+	pin 3  
    out_ct	pin 4  
    out-	pin 5
  • LL3814
    The LL3814 is a C-core line output transformer, turns ratio 3 + 3 : 1+1

    Usage, 3 : 2    
    In+		pin 1 + pin 6  
    in-		pin 3 + pin 4  
    leave		pin 2 + pin 5      
    Out+		pin 7  
    Out-		pin 11  
    Connect	pin 12 + pin 8  
    Ground		pin 10  no pin at 9
  • LL3815
    LL3815 is a small mu metal core microphone / line input transformer, turns ratio 1+1 : 5

    Usage, 1 : 5    
    In+		pin 1 + pin 4  
    In-		pin 2 + pin 3    
    out+		pin 8  
    out-		pin 6  
    Shields		pin 5    no pin at 7
  • LL3817
    The LL3817 is identical to LL3814 (above), except that height is 1 mm less.
  • I have some LL4202. What is it and how can I use it?
    LL4202 is a high level mu metal core output transformer, turns ratio 1:1.

    Usage:  
    in+	pin 1  
    in-	pin 2  
    out+	pin 6  
    out-	pin 5  
    Shields	pin 4
  • How can I use the LL4501?
    The LL4501 is a C-core line output transformer. Standard version is gapped for DC current.
    LL4501G is gapped for a smaller current and has been used in telephone hybrid circuits

    Pin configuration (as seen from PIN side)    
    4,      3,      2,      1 
    
              
    8,               6,      5,      
    
    LL4501 usage (turn ration 1 : 1)    
    pin 1 		primary signal in (+)  
    pin 3 		primary side ground  
    pin 2 + pin 4	connect    
    pin 8		out +  
    pin 6		out -  
    pin 5		Faraday shield. Ground.
  • What is LL4601

    LL4601 is a high impedance line input transformer, 2:1+1

    Pin configuration (as seen from PIN side)
    4,     3,            1,    
    
                
    8,     7,    6,     5,   
    
    Usage (1:1):  
    in+	pin 8  
    in-	pin 5  
    connect pin 6 + pin 7  
    out+	pin 4  
    out-	pin 3  
    Faraday shield	pin 1
  • How can I use the LL4602?
    The LL4602 is a C-core line output transformer for unbalanced (single-end) drive. Internal structure is similar to the LL5402.

    LL4602 usage (turn ration 1 : 1)
    
    Pin 1 + Pin 5	primary ground  
    pin 2 + pin 4	primary signal in (+)  
    pin 3 not used      
    pin 7		out +  
    pin 10		out -  
    pin 6 + pin 9	connect
  • Line input transformer LL4603
    LL4603 is an improved LL4601, normally used 1 : 1

    Pin configuration (as seen from PIN side)    
    
    4,     3,          1,                
    
    8,    7,    6,    5,    
    
    Usage (1:1):  
    in+	pin 8  
    in-	pin 5  
    connect pin 6 + pin 7  
    out+	pin 4  
    out-	pin 3  
    Faraday shield	pin 1
  • LL4604
    LL4604 is a general purpose isolation transformer with a mu metal lamination core.
    Turns ratio 1+1 : 1ct.

    Usage:  
    in+	pin 1  
    in-	pin 2  
    in+	pin 4  
    in-	pin 5  (Pins 1, 2, 4, 5 can be used in series or in parallel)    
    out+	pin 7  
    out centertap	pin 3  
    out-	pin 9    
    Shields	pins 6 and 10
  • LL4901
    LL4901 is a 200 ohm : 5 k microphone input transformer, winding turns ratio 1+1:10. The LL4901 is
    discontinued and no data sheet is available. For replacements, please study LL1538.

    Pin configuration (transformer seen from component side with label readable)    
    
    4,    3,    2,    1
    
          LL4901      
    
    8,    7,   6,    5        
    
    LL4901 Usage (1:5)  
    in+		pin 1  
    in-		pin 4  
    connect pis 2 + 3  
    out+	pin 6  
    out-	pin 7  
    ground  pin 5
  • LL4902
    LL4902 is a high turns ratio (1+1 : 22) microphone input transformer with double Faraday shields.
    LL4902 was designed for a customer in Australia, and is probably suitable for a 75 ohm : 10k application.
    The LL4902 is discontinued and no data sheet is available, but we do actually have approx. 100 x (non-ROHS-compliant)
    LL4902 in stock.

    Pin configuration (transformer seen from component side with label readable)    
    
    4,    3,    2,    1
    
           LL4902      
    
    8,    7,    6,    5        
    
    LL4902 Usage (1:11)  
    in+		pin 1  
    in-		pin 4  
    connect 	pins 2 + 3  
    out+		pin 6  
    out-		pin 7  
    ground 1	pin 5  
    ground 2 + case and core 	pin 8
  • I have some output transformers LL5008. Is there a data sheet?
    LL5008 is a low profile, low leakage inductance line output transformer. Connections are made through short flying leads and
    not through pins. This was a solution to save board height.
    I am afraid we have no data sheet for this type. For similar function, please study the LL1524 or LL7401.

    Pin configuration (transformer seen from side of flying leads)    
    1		        5  
    2		        6    
    
    3	        	7  
    4	     	    8      
    
    LL5008 usage (1:1)  
    in+	pin 2  
    in-	pin 4  
    connect pins 1+3  
    out+	pin 6  
    out-	pin 8  
    connect pins 5+7
  • Line output transformer LL5011
    LL5011 is a pin version of LL5008, normally used 1 : 1
    Very low leakage inductance.

    Pin configuration (as seen from PIN side)    
    
    5,   4,   3,   2,   1
            
    
    
    10,  9,        7,   6,    
    
    Usage (1:1):  
    in+	pin 1  
    in-	pin 4  
    connect pin 2 + pin 5    
    out+	pin 10  
    out-	pin 7  
    connect pin 9 + 6    
    Pin 3 	not connected
  • Calrec line output transformer LL5602
    LL5602 is a line output transformer designed for Calrec Audio, probably used as a stepup output transformer, turns ratio 1 : 1.6 or 1 : 3.2

    Pin configuration (as seen from PIN side)    
    6,   5,   4,   3,   2,   1              
    
    
    12,  11,      9,  8,   7      
    
    Usage (1: 1.6):    
    in+	pin 1  
    in- 	pin 4  
    connect pin 6 + 3    
    out+	pin 7 + 12  
    out-	pin 11 + 8  
    Faraday shield + housing pin 9          
    
    Usage (1: 3.2):    
    in+	pin 1  
    in- 	pin 4  
    connect  pin 6 + 3    
    out+	pin 7  
    out-	pin 11  
    connect pin 12+8  
    Faraday shield + housing pin 9
  • You have a data sheet for LL5801?
    LL5801 is a 1+1 : 2 audio isolation transformer originally designed for Kungliga Dramatiska Teatern (Royal Theater) in Stockholm.
    Sorry, no data sheet. A modern replacemen is LL1527 or LL1588.
    LL5801 pinout and usage:

    Pin configuration (transformer seen from component side with label readable)
    
        
    4,  	3,  	2, 	1      	
    
        LL5801    
    
    8,	 7,  	6,	 5    
    
    (I am sorry, but I am unsure about orientation, as we have no samples left in stock.
    There is connection between pins 1 and 2, but not between pins 5 and 6)    
    
    LL5801 Usage (1:1)  
    in+	pin 1  
    in-	pin 4  
    connect 	pin 2 + 3  
    out+	pin 6  
    out-	pin 7  
    ground  pin 5+8	(Faraday shield)
  • SR501
    SR501 is a high level 600 ohm : 600 ohm isolation transformer

    in+	1  
    in-	5  
    out+	7  
    out-	9  
    Faraday shields 6+10
  • SR502
    SR502 is a high impedance bridging input transformer

    in+	1  
    in-	5  
    out+	7  
    out-	9  
    Faraday shields 6+10
  • SR503
    SR503 is a line output transformer with turns ratio 1.4 : 1

    in+	8  
    in-	6  
    out+	10  
    out-	4
  • SR504a och SR504
    SR504A is a microphone transformer 200 ohm : 2k

    in+		2  
    in-		3  
    out+		6  
    out-		7  
    core		1  
    Housing 	4  
    Faraday shield 5

    SR504a is similar to the more modern transformer LL1538