Blocking Oscillator (CB21815E)

We found this circuit in the 1960 Mullard transistor manual. The transistor is made of germanium.

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Preamplifier and Tone Generator (CB20004E)
This is a combined circuit of tone generator and preamplifier. We found it in a 1975...
Multipurpose Alarm (CB17301E)
We found this simple alarm circuit in a 1986 documentation. The circuit uses sensors of the NA...
PLL LM3900 (CB14199E)
We found this circuit in the Linear Applications Handbook by National Semiconductor. The base is...