237.- Hand-controlled acoustic-
optic doorbell
238.- Ma gnet-controlled acoustic-
optic doorbell
239.- Light-controlled acoustic-optic
doorbell
240.- Water-controlled acoustic-
optic doorbell
241.- Sound-controlled acoustic-
optic doorbell (1)
242.- Sound-controlled acoustic-
optic doorbell (2)
243.- Motor-controlled acoustic-
optic doorbell (1)
244.- Motor-controlled acoustic-
optic doorbell (2)
Shift the switch to 3V position
The operation of these circuits is the same as the projects 60 to 67.
ENGLISH-69