P1 on this Radio Shack circuit is a 6 V lamp with current up to 500 mA depending on Q2. The frequency is given by C1 which can have a modern standard value such as 3.3 uF or even 4.7 uF.
The gain of the Operational Amplifier in the figure is given by the ratio between R1 and R2. In...
This conventional window comparator configuration was found in an old documentation. It is valid...
This circuit uses a Norton operational amplifier to generate 1 kHz pulses with a 1 to 60...