Visual metronome (CB21062E)

Based on the well-known LM3909, this LED pulser circuit was found in American documentation from the 90's. The power supply is only 1.5 V.

| Clique na imagem para ampliar |

Two Transistor Siren (CB4210E)
This well-known siren configuration using complementary transistors is from a 1980s documentation. The...
Light Beam Operated Relay (CB4956E)
This circuit was found in an old American magazine and could make use of more modern components...
RIAA Preamp (CB1260E)
This circuit is from the Philips integrated circuits manual of 1990. It is intended for magnetic...