[HATS] Part needed LH0002

[Steve Bunch]

Dave,

Jameco (www.jameco.com) has them for about $10.  It's a current buffer 
amplifier.  It would probably be driving a cable or some other low 
impedance, moderate-current load.  In general, op amps won't have the 
bandwidth or low output impedance it would take to substitute easily.

If you look at the jameco website for this part (search for lh0002 on 
the main page), there's a copy of the National Semi datasheet.  It has a 
functional schematic for the part.  If you're in a hurry and have a good 
junkbox, you could make an adequate substitute on a DIP header. It's 4 
transistors (2 NPN, 2 PNP) and 4 resistors, and typical values are 
listed for the resistors. You could use any reasonable switching 
transistors capable of a steady-state 100mA or so current -- 
2N3904's/2N3906's would probably be fine, for example.  Keep the leads 
short and make sure the transistors don't get too hot to touch.

Steve, K9SRB

KC3AM@aol.com wrote:

>I have a need for a National chip that has been obsolete for a few years. It 
>is a LH0002 10 pin dip OP amp. I have E-mailed National & others looking for 
>a replacement and am awaiting their reply.
>
>This was used in the VS-100 ATV repeater controller from Micro Computer 
>products that I have had for a few years.
>
>Any other suggestions?
>
>Thanks,
>
>Dave KC3AM
>
>
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