Speaker output reflex receiver (T1653E)

Found in a 1924 publication, this 2-valve receiver has a speaker output. Power comes from several batteries. Information about the coils is given.

| Clique na imagem para ampliar |

Indicator Light 555 (CB13608E)
When the input of this circuit goes to high level, the LEDs start to flash alternately. The...
Sonic relay (CB23784E)
This circuit already uses an integrated circuit from the time. Note the different encapsulation of the...
Lead Acid Battery Charger (CB26301E)
This power charger was found in a 1990s issue of Popular Electronics. Integrated circuits must be...