flickr By Tom.Whitwell
Details via Muff's
"I was just about to buy an A199 spring reverb when I decided to save 4hp of space and build my own.
The circuit is based on Roy Mallory's tech note and tone control, which is useful - a symmetrical cut/boost of bass and treble. The drive, recovery, tone and blend buffer take the four amps in a TL074.
The gain on the drive circuit is reduced quite a bit - R10 is 660R rather than 62R (it's R1 in Mallory's article), and the recovery circuit has a variable drive.
I put a couple of phono jacks on the back of my Doepfer case, so it's easy to plug in an external tank - a nice rich 6-spring 9EB2C1B (mainly because I built the circuit with the 8EB2C1B from a fender amp)"
How are capacitor's polarity? (220nf, 22uf)
ReplyDeleteVery good!
ReplyDeletehi nice circuit. just to be sure. Those electrolytic are polarized so they have a plus and minus side. On the schematic, I see non-polarized symbols.
ReplyDeleteNone of the capacitor polarities matter - the supply is bipolar (+/-15V), so the ports of the op-amps are all nominally at 0V. The supply filter capacitors (not shown in the diagram) will have to be appropriately polarised as they will be either above or below the ground. If you can't work these things out for yourself, perhaps you should take up another hobby!
ReplyDelete