12, 9, 5V DC Power Supply by barber408

4017 Decade Counter/Divider LED Driver by barber408 ★1

555-LED-driver by barber408

Alarm sounder by barber408

Alternating CMOS blinker by barber408

Arduino-keypad by barber408

CD4066 - Quad Analog Switch by barber408

DTMF 4x4 Matrix Keypad by barber408

dual-vcos by barber408

Matrix Keypad Scanner by barber408

MIDI-rx by barber408

MOSFET Modulators by barber408

Op Amp Voltage Follower by barber408 ★1

Random Number Generator by barber408

shunt-regulator by barber408

TL431-regulator by barber408

Voltage-Controlled Amplifier by barber408 ★1

Voltage-Controlled Filter (VCF) by barber408