bravokilo
Oct 07, 2006, 12:11 AM
Hi, I am BravoKilo and have posted in my Blog three circuits of servo amps of the sixties. It may seem going backwards but it is very educational for thoe who want to see how it was done before and how it is still the same thing today but all inside the chip. There are improvements, of course. They used 4 wires during that era. The circuits shown uses 4 wires, i.e. with a center tap in the battery which today will be considered a nuisance. however, the O.S. circuit, can be easily modified as only the moter uses the CT and not the electoni circuit itself. Just adap an H bridge and we have a 3 wire system with no CT. The Heathkit circuit can be hybred into the O.S. circuit and adapt its use of the tuing capacitor of AM radios in place of the feedback pot. In fact, we can use air tuing condensers to do the job and elimilate jitters caused by carbon dirt in the pot. Again, size? well, it is not meant to be used in small crafts like e-planes. But it can be used for brute servos to control the sails in sailboats, and for robots. contact me if anyone wishes to convert the hand electric drill inot a powerful brute servo, fiully proportiional.
BravoKilo :)
BravoKilo :)