We found this circuit in the Linear Applications Handbook by National Semiconductor. It uses the LM3900, an operational transconductance amplifier as a base. Q1 can be a 2N2222 or similar.
This circuit is suggested by Sanyo and is based on the integrated circuit LA4430, manufactured by it. With a...
This digital signal attenuator was found in a 90s Electronic Design. The circuit operates at...
This circuit generates noise pulses for audio equipment probes. The circuit is from a 90’s 303...