Battery Charge Indicator (CB26002E)

This circuit was found in the March 1997 Electronics Now magazine. It uses a common analog indicator and the transistor is a general purpose one.

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Solar Frequency Standard (CB21951E)
This solar cell powered circuit generates a standard 100 kHz signal. The circuit is from a 1960...
PLL LM3900 (CB14199E)
We found this circuit in the Linear Applications Handbook by National Semiconductor. The base is...
Baxandall tone control (CB20804E)
In the figure we have the typical circuit of a Baxandall tone control applied to an operational...