aion Lab Series Manuale - Pagina 10

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BUILD NOTES, CONT.

LM13700 vs. CA3080

The original L5 Preamp used CA3080s as in the original amp. These have been discontinued for a long

time, and while they have been reissued and are not terribly hard to find, they are expensive.

The LM13700 is essentially a dual version of the CA3080/CA3094 and is still readily available. Since the

L5 circuit uses two CA3080s, it seemed like a good opportunity to replace them with a single LM13700.

The only change that this required was to add a second 100k resistor (R53) to cut the compressor LED's

voltage in half, since the LM13700's I

pin sits at twice the voltage of the CA3080's pin. This extra

ABC

resistor prevents the LED from staying on all the time, which was the only side-effect of substituting the

LM13700 in place of the CA3080.

Enclosure size

This project was designed for the Hammond 1590BBS enclosure, which has the same height as the

125B or 1590N1. If you don't use the Hammond brand, be careful—not all 1590BBS enclosures are the

same. For example, Love My Switches sells two different types, and the

CNC Pro

version is correct while

the standard one is too short.

The 1590BB2 seems like a close equivalent, but it's about 4mm shorter. It may be possible to fit this

circuit in a 1590BB2, but we have not tested it, so you're on your own!

Another alternative is the 1590C (also available from Tayda and Love My Switches). It's about 10mm

taller than necessary, but if that's all you can find then it will definitely work.

L5 PREAMP DRIVE CHANNEL