Two-channel peak indicator (CB21975E)

This peak indicator for stereo amplifiers uses a CA3130. The 80's circuit does not need a symmetrical power supply.

Generator 4mA at 20 mA with the XTR115 and PGA309 (CB12946E)
The presented circuit is suggested by Texas Instruments (www.ti.com) in its Application Report...
Nanoammeter (CB5135E)
This circuit was found in the used integrated circuit manufacturer's manual. The table beside the...
High Fidelity Preamplifier (CB13215E)
This circuit is from old Motorola documentation, from the 70s. The integrated circuit is difficult to...