these voltage-controlled oscillators (vcos) are improved versions of the original vco family: sn54ls124 sn54ls324...
1-Bit TTL Driver, 5V, CDIP, -55°C to 125°C
Oscillator VCO 1.1MHz to 25MHz 45pF Squarewave 50% 5V 14-Pin CDIP Thru-Hole Tube
