◊ PCB Documentation

158 Dual Sine/Sawtooth Oscillator

Two independent oscillators in one unit. Frequencies are continuously variable from 5 cps to 20 kc and may be controlled internally or with externally applied control voltages. Waveshape is continuously adjustable from sine to sawtooth; oscillators may be wideband frequency modulated.

• Sine/Sawtooth Oscillator Schematics. This PCB is based on version Rev. A (4/1/68), all transistor. The later Rev. B used a UA726 in the expo converter.
• Builds: David Brown's essential build/repair notes; Mike Peake's build notes with PCB artwork from his Ebolatone blog. Thanks to both of them for sharing their information so generously.
• FPD front panel file (New!)

PCBs are $25.00 @ — ORDER HERE

Bill of Materials (value/qty)

• Resistors
  • 1.0K x 4
  • 10K x 8
  • 150R x 2
  • 15K x 2
  • 1.5K x 16
  • 150K x 2
  • 220R x 2
  • 2.2K x 10
  • 2.2M x 2
  • 3.3K x 16
  • 33K x 2
  • 330K x 4
  • 47R x 2
  • 470R x 4
  • 4.7K x 8
  • 6.8K x 10
  • 2.2R, 1/2 Watt x 2
  • 1.0K Trimpot x 6
  • 50K audio taper pot x 4
  • 10K linear pot x 2
• Capacitors
  • 47pF x 2
  • 22pF x 2
  • 910pF x 4 (can sub 1nf)
  • 4.7nF (polystyrene) x 2
  • 47nF x 2
  • 1uF x 2
  • 15uF tantalum x 2
  • 56uF tantalum x 4 (can sub 47uf)
  • 47uF tantalum x 2
• Semiconductors*
  • 1N457 x 6
  • (MD708B) 2N5550 x 4
  • (2N4916) 2N5401 x 12
  • (2N3565) PN3565 x 14
  • (U147) 2N5020 2N5460 x 2
  • (E101) J201 x 2
• Misc.
  • .156" 4-pin power header x1
  • DPDT Switch x

Errata/Notes

• *Transistor substitutions:
  • Q1/Q2, NPN matched pair: MD708b is unobtainium - substitute 2n5550 (a matched pair of 2n3904 may also be used)
  • Q3, Q5, Q6, Q12, Q13, Q14, 2N4916 PNP: technically obsolute but pretty easily available NOS; 2N5401 would be a recommended replacement (check pin-out)
  • Q4, 2N3391 NPN: currently available from Mouser
  • Q6, P-channel FET: U47 is unobtanium, substitute 2N5020 2N5460 (thanks Mike Peake for the updated recommendation)
  • Q4, Q8-Q11, Q16-18, 2N3565 NPN: currently available from Mouser as PN3565
• Some builders have substituted 2n3904 for all NPN and 2n3906 for all PNP transistors, across the board; I've not tried this yet myself.
• C6 was orginally a 5-35pf trimmer capacitor; substituted a fixed 22pf
• R35 was orginally a 3k3 fixed resistor; substituted a 5k variable resistor to trim signal feeding sine shaper (Mike Peake's suggestion)
• Some builders have changed R45 from 3k3 to 4k7, to modify sine waveform